Made Classic difficulty almost exactly like the original.

There are only a couple changes that I've left in:

1. On normal missions, the edge of the screen still doesn't slow you down.
2. The shop still does not have the old bug where selling was based on the price of the next item.
3. Not sure about this, but some powerups don't spawn if they're of no use to you; I believe this was not in the original, but it's been left in anyway.
4. Not sure about this either, but I believe the original had the 3-way spread much wider. This has not been adjusted for Classic difficulty.

Other than those three, Classic difficulty is now exactly the same,
including a re-implementation of the whole "score" system where destroying
a ship nets you money instantly and the absurd system where you buy only
10 plasma capacity at a time. I might adjust 1, 3, and/or 4 above later
on.

src/alien.cpp

@@ -129,6 +129,9 @@ void alien_defs_init()
 	alien_defs[CD_DUALFIGHTER].collectChance = 50;
 	alien_defs[CD_DUALFIGHTER].collectType = P_ANYTHING;
 	alien_defs[CD_DUALFIGHTER].collectValue = 50;
+	alien_defs[CD_DUALFIGHTER].collectTypeOriginal = P_ANYTHING;
+	alien_defs[CD_DUALFIGHTER].collectValueOriginal = 50;
+	alien_defs[CD_DUALFIGHTER].score = 25;
 	alien_defs[CD_DUALFIGHTER].flags = FL_WEAPCO;
 
 	// Missile Boat
@@ -146,6 +149,9 @@ void alien_defs_init()
 	alien_defs[CD_MISSILEBOAT].collectChance = 25;
 	alien_defs[CD_MISSILEBOAT].collectType = P_ANYTHING;
 	alien_defs[CD_MISSILEBOAT].collectValue = 75;
+	alien_defs[CD_MISSILEBOAT].collectTypeOriginal = P_ANYTHING;
+	alien_defs[CD_MISSILEBOAT].collectValueOriginal = 75;
+	alien_defs[CD_MISSILEBOAT].score = 250;
 	alien_defs[CD_MISSILEBOAT].flags = FL_WEAPCO;
 
 	//Prototype fighter
@@ -163,6 +169,9 @@ void alien_defs_init()
 	alien_defs[CD_PROTOFIGHTER].collectChance = 50;
 	alien_defs[CD_PROTOFIGHTER].collectType = P_ANYTHING;
 	alien_defs[CD_PROTOFIGHTER].collectValue = 50;
+	alien_defs[CD_PROTOFIGHTER].collectTypeOriginal = P_ANYTHING;
+	alien_defs[CD_PROTOFIGHTER].collectValueOriginal = 50;
+	alien_defs[CD_PROTOFIGHTER].score = 50;
 	alien_defs[CD_PROTOFIGHTER].flags = FL_WEAPCO;
 
 	// Phoebe and Ursula
@@ -180,6 +189,9 @@ void alien_defs_init()
 	alien_defs[CD_FRIEND].collectChance = 0;
 	alien_defs[CD_FRIEND].collectType = P_CASH;
 	alien_defs[CD_FRIEND].collectValue = 0;
+	alien_defs[CD_FRIEND].collectTypeOriginal = P_CASH;
+	alien_defs[CD_FRIEND].collectValueOriginal = 0;
+	alien_defs[CD_FRIEND].score = 0;
 	alien_defs[CD_FRIEND].flags = FL_FRIEND;
 
 	// Boss 1
@@ -197,6 +209,9 @@ void alien_defs_init()
 	alien_defs[CD_FRIGATE].collectChance = 100;
 	alien_defs[CD_FRIGATE].collectType = P_CASH;
 	alien_defs[CD_FRIGATE].collectValue = 500;
+	alien_defs[CD_FRIGATE].collectTypeOriginal = P_CASH;
+	alien_defs[CD_FRIGATE].collectValueOriginal = 250;
+	alien_defs[CD_FRIGATE].score = 500;
 	alien_defs[CD_FRIGATE].flags = FL_WEAPCO | FL_NOBANTER;
 
 	alien_defs[CD_FRIGATE_WING1].classDef = CD_FRIGATE_WING1;
@@ -213,6 +228,9 @@ void alien_defs_init()
 	alien_defs[CD_FRIGATE_WING1].collectChance = 100;
 	alien_defs[CD_FRIGATE_WING1].collectType = P_ANYTHING;
 	alien_defs[CD_FRIGATE_WING1].collectValue = 250;
+	alien_defs[CD_FRIGATE_WING1].collectTypeOriginal = P_ANYTHING;
+	alien_defs[CD_FRIGATE_WING1].collectValueOriginal = 250;
+	alien_defs[CD_FRIGATE_WING1].score = 500;
 	alien_defs[CD_FRIGATE_WING1].flags = FL_WEAPCO | FL_DAMAGEOWNER;
 
 	alien_defs[CD_FRIGATE_WING2].classDef = CD_FRIGATE_WING2;
@@ -229,6 +247,9 @@ void alien_defs_init()
 	alien_defs[CD_FRIGATE_WING2].collectChance = 100;
 	alien_defs[CD_FRIGATE_WING2].collectType = P_ANYTHING;
 	alien_defs[CD_FRIGATE_WING2].collectValue = 250;
+	alien_defs[CD_FRIGATE_WING2].collectTypeOriginal = P_ANYTHING;
+	alien_defs[CD_FRIGATE_WING2].collectValueOriginal = 250;
+	alien_defs[CD_FRIGATE_WING2].score = 500;
 	alien_defs[CD_FRIGATE_WING2].flags = FL_WEAPCO | FL_DAMAGEOWNER;
 
 	// Transport ship
@@ -246,6 +267,9 @@ void alien_defs_init()
 	alien_defs[CD_TRANSPORTSHIP].collectChance = 100;
 	alien_defs[CD_TRANSPORTSHIP].collectType = P_WEAPONS;
 	alien_defs[CD_TRANSPORTSHIP].collectValue = 40;
+	alien_defs[CD_TRANSPORTSHIP].collectTypeOriginal = P_WEAPONS;
+	alien_defs[CD_TRANSPORTSHIP].collectValueOriginal = 30;
+	alien_defs[CD_TRANSPORTSHIP].score = 25;
 	alien_defs[CD_TRANSPORTSHIP].flags = FL_WEAPCO | FL_NOFIRE;
 
 	// Cargo ship
@@ -263,6 +287,9 @@ void alien_defs_init()
 	alien_defs[CD_CARGOSHIP].collectChance = 50;
 	alien_defs[CD_CARGOSHIP].collectType = P_ANYTHING;
 	alien_defs[CD_CARGOSHIP].collectValue = 100;
+	alien_defs[CD_CARGOSHIP].collectTypeOriginal = P_ANYTHING;
+	alien_defs[CD_CARGOSHIP].collectValueOriginal = 100;
+	alien_defs[CD_CARGOSHIP].score = 25;
 	alien_defs[CD_CARGOSHIP].flags = FL_WEAPCO | FL_NOFIRE;
 
 	// Weapco Miner
@@ -280,6 +307,9 @@ void alien_defs_init()
 	alien_defs[CD_MINER].collectChance = 100;
 	alien_defs[CD_MINER].collectType = P_ANYTHING;
 	alien_defs[CD_MINER].collectValue = 30;
+	alien_defs[CD_MINER].collectTypeOriginal = P_ANYTHING;
+	alien_defs[CD_MINER].collectValueOriginal = 30;
+	alien_defs[CD_MINER].score = 100;
 	alien_defs[CD_MINER].flags = FL_WEAPCO | FL_NOFIRE | FL_DROPMINES;
 
 	// Kline
@@ -297,6 +327,9 @@ void alien_defs_init()
 	alien_defs[CD_KLINE].collectChance = 0;
 	alien_defs[CD_KLINE].collectType = P_ANYTHING;
 	alien_defs[CD_KLINE].collectValue = 0;
+	alien_defs[CD_KLINE].collectTypeOriginal = P_ANYTHING;
+	alien_defs[CD_KLINE].collectValueOriginal = 0;
+	alien_defs[CD_KLINE].score = 0;
 	alien_defs[CD_KLINE].flags = FL_WEAPCO | FL_ALWAYSFACE | FL_CIRCLES | FL_NOBANTER;
 
 	// Aim Fighter
@@ -314,6 +347,9 @@ void alien_defs_init()
 	alien_defs[CD_AIMFIGHTER].collectChance = 75;
 	alien_defs[CD_AIMFIGHTER].collectType = P_ANYTHING;
 	alien_defs[CD_AIMFIGHTER].collectValue = 100;
+	alien_defs[CD_AIMFIGHTER].collectTypeOriginal = P_ANYTHING;
+	alien_defs[CD_AIMFIGHTER].collectValueOriginal = 100;
+	alien_defs[CD_AIMFIGHTER].score = 50;
 	alien_defs[CD_AIMFIGHTER].flags = FL_WEAPCO | FL_AIMS;
 
 	// Slave ship
@@ -331,6 +367,9 @@ void alien_defs_init()
 	alien_defs[CD_SLAVETRANSPORT].collectChance = 100;
 	alien_defs[CD_SLAVETRANSPORT].collectType = P_SLAVES;
 	alien_defs[CD_SLAVETRANSPORT].collectValue = 25;
+	alien_defs[CD_SLAVETRANSPORT].collectTypeOriginal = P_SLAVES;
+	alien_defs[CD_SLAVETRANSPORT].collectValueOriginal = 25;
+	alien_defs[CD_SLAVETRANSPORT].score = 25;
 	alien_defs[CD_SLAVETRANSPORT].flags = FL_WEAPCO | FL_NOFIRE | FL_NOBANTER;
 
 	// Good Transport
@@ -348,6 +387,9 @@ void alien_defs_init()
 	alien_defs[CD_GOODTRANSPORT].collectChance = 0;
 	alien_defs[CD_GOODTRANSPORT].collectType = P_ANYTHING;
 	alien_defs[CD_GOODTRANSPORT].collectValue = 0;
+	alien_defs[CD_GOODTRANSPORT].collectTypeOriginal = P_ANYTHING;
+	alien_defs[CD_GOODTRANSPORT].collectValueOriginal = 0;
+	alien_defs[CD_GOODTRANSPORT].score = 0;
 	alien_defs[CD_GOODTRANSPORT].flags = FL_FRIEND | FL_NOFIRE | FL_AIMS;
 
 	// Sid Wilson
@@ -365,6 +407,9 @@ void alien_defs_init()
 	alien_defs[CD_SID].collectChance = 0;
 	alien_defs[CD_SID].collectType = P_ANYTHING;
 	alien_defs[CD_SID].collectValue = 0;
+	alien_defs[CD_SID].collectTypeOriginal = P_ANYTHING;
+	alien_defs[CD_SID].collectValueOriginal = 0;
+	alien_defs[CD_SID].score = 0;
 	alien_defs[CD_SID].flags = FL_FRIEND | FL_AIMS;
 
 	// Mining Vessel Boss
@@ -382,6 +427,9 @@ void alien_defs_init()
 	alien_defs[CD_MINEBOSS].collectChance = 100;
 	alien_defs[CD_MINEBOSS].collectType = P_ANYTHING;
 	alien_defs[CD_MINEBOSS].collectValue = 1000;
+	alien_defs[CD_MINEBOSS].collectTypeOriginal = P_ANYTHING;
+	alien_defs[CD_MINEBOSS].collectValueOriginal = 255;
+	alien_defs[CD_MINEBOSS].score = 1000;
 	alien_defs[CD_MINEBOSS].flags = FL_WEAPCO | FL_IMMORTAL | FL_NOBANTER;
 
 	alien_defs[CD_BOSS2_WING1].classDef = CD_BOSS2_WING1;
@@ -398,6 +446,9 @@ void alien_defs_init()
 	alien_defs[CD_BOSS2_WING1].collectChance = 100;
 	alien_defs[CD_BOSS2_WING1].collectType = P_ANYTHING;
 	alien_defs[CD_BOSS2_WING1].collectValue = 250;
+	alien_defs[CD_BOSS2_WING1].collectTypeOriginal = P_ANYTHING;
+	alien_defs[CD_BOSS2_WING1].collectValueOriginal = 255;
+	alien_defs[CD_BOSS2_WING1].score = 1000;
 	alien_defs[CD_BOSS2_WING1].flags = FL_WEAPCO | FL_DAMAGEOWNER | FL_NOBANTER;
 
 	alien_defs[CD_BOSS2_WING2].classDef = CD_BOSS2_WING2;
@@ -414,6 +465,9 @@ void alien_defs_init()
 	alien_defs[CD_BOSS2_WING2].collectChance = 100;
 	alien_defs[CD_BOSS2_WING2].collectType = P_ANYTHING;
 	alien_defs[CD_BOSS2_WING2].collectValue = 250;
+	alien_defs[CD_BOSS2_WING2].collectTypeOriginal = P_ANYTHING;
+	alien_defs[CD_BOSS2_WING2].collectValueOriginal = 255;
+	alien_defs[CD_BOSS2_WING2].score = 1000;
 	alien_defs[CD_BOSS2_WING2].flags = FL_WEAPCO | FL_DEPLOYDRONES | FL_DAMAGEOWNER | FL_NOBANTER;
 
 	alien_defs[CD_BOSS2_WING3].classDef = CD_BOSS2_WING3;
@@ -430,6 +484,9 @@ void alien_defs_init()
 	alien_defs[CD_BOSS2_WING3].collectChance = 100;
 	alien_defs[CD_BOSS2_WING3].collectType = P_ANYTHING;
 	alien_defs[CD_BOSS2_WING3].collectValue = 250;
+	alien_defs[CD_BOSS2_WING3].collectTypeOriginal = P_ANYTHING;
+	alien_defs[CD_BOSS2_WING3].collectValueOriginal = 255;
+	alien_defs[CD_BOSS2_WING3].score = 1000;
 	alien_defs[CD_BOSS2_WING3].flags = FL_WEAPCO | FL_DEPLOYDRONES | FL_DAMAGEOWNER | FL_NOBANTER;
 
 	alien_defs[CD_BOSS2_WING4].classDef = CD_BOSS2_WING4;
@@ -446,6 +503,9 @@ void alien_defs_init()
 	alien_defs[CD_BOSS2_WING4].collectChance = 100;
 	alien_defs[CD_BOSS2_WING4].collectType = P_ANYTHING;
 	alien_defs[CD_BOSS2_WING4].collectValue = 250;
+	alien_defs[CD_BOSS2_WING4].collectTypeOriginal = P_ANYTHING;
+	alien_defs[CD_BOSS2_WING4].collectValueOriginal = 255;
+	alien_defs[CD_BOSS2_WING4].score = 1000;
 	alien_defs[CD_BOSS2_WING4].flags = FL_WEAPCO | FL_DAMAGEOWNER | FL_NOBANTER;
 
 	// Drone
@@ -463,6 +523,9 @@ void alien_defs_init()
 	alien_defs[CD_DRONE].collectChance = 10;
 	alien_defs[CD_DRONE].collectType = P_SHIELD;
 	alien_defs[CD_DRONE].collectValue = 1;
+	alien_defs[CD_DRONE].collectTypeOriginal = P_SHIELD;
+	alien_defs[CD_DRONE].collectValueOriginal = 1;
+	alien_defs[CD_DRONE].score = 0;
 	alien_defs[CD_DRONE].flags = FL_WEAPCO | FL_NOBANTER;
 
 	// Experimental Fighter
@@ -480,6 +543,9 @@ void alien_defs_init()
 	alien_defs[CD_CLOAKFIGHTER].collectChance = 100;
 	alien_defs[CD_CLOAKFIGHTER].collectType = P_CASH;
 	alien_defs[CD_CLOAKFIGHTER].collectValue = 250;
+	alien_defs[CD_CLOAKFIGHTER].collectTypeOriginal = P_CASH;
+	alien_defs[CD_CLOAKFIGHTER].collectValueOriginal = 255;
+	alien_defs[CD_CLOAKFIGHTER].score = 550;
 	alien_defs[CD_CLOAKFIGHTER].flags = FL_WEAPCO | FL_CANCLOAK | FL_RUNSAWAY;
 
 	// Evil Ursula
@@ -497,6 +563,9 @@ void alien_defs_init()
 	alien_defs[CD_EVILURSULA].collectChance = 100;
 	alien_defs[CD_EVILURSULA].collectType = P_ESCAPEPOD;
 	alien_defs[CD_EVILURSULA].collectValue = 1;
+	alien_defs[CD_EVILURSULA].collectTypeOriginal = P_ESCAPEPOD;
+	alien_defs[CD_EVILURSULA].collectValueOriginal = 1;
+	alien_defs[CD_EVILURSULA].score = 500;
 	alien_defs[CD_EVILURSULA].flags = FL_WEAPCO | FL_NOBANTER;
 
 	// Mercenary
@@ -514,6 +583,9 @@ void alien_defs_init()
 	alien_defs[CD_KRASS].collectChance = 100;
 	alien_defs[CD_KRASS].collectType = P_ANYTHING;
 	alien_defs[CD_KRASS].collectValue = 2250;
+	alien_defs[CD_KRASS].collectTypeOriginal = P_ANYTHING;
+	alien_defs[CD_KRASS].collectValueOriginal = 255;
+	alien_defs[CD_KRASS].score = 2000;
 	alien_defs[CD_KRASS].flags = FL_FRIEND | FL_IMMORTAL | FL_NOBANTER;
 
 	// Executive Transport
@@ -530,7 +602,10 @@ void alien_defs_init()
 	alien_defs[CD_EXEC].chance[1] = 0;
 	alien_defs[CD_EXEC].collectChance = 0;
 	alien_defs[CD_EXEC].collectType = P_ANYTHING;
-	alien_defs[CD_EXEC].collectValue = 2000;
+	alien_defs[CD_EXEC].collectValue = 0;
+	alien_defs[CD_EXEC].collectTypeOriginal = P_ANYTHING;
+	alien_defs[CD_EXEC].collectValueOriginal = 0;
+	alien_defs[CD_EXEC].score = 2000;
 	alien_defs[CD_EXEC].flags = FL_WEAPCO | FL_NOFIRE | FL_NOBANTER;
 
 	// Asteroid
@@ -548,6 +623,9 @@ void alien_defs_init()
 	alien_defs[CD_ASTEROID].collectChance = 25;
 	alien_defs[CD_ASTEROID].collectType = P_ORE;
 	alien_defs[CD_ASTEROID].collectValue = 1;
+	alien_defs[CD_ASTEROID].collectTypeOriginal = P_ORE;
+	alien_defs[CD_ASTEROID].collectValueOriginal = 1;
+	alien_defs[CD_ASTEROID].score = 0;
 	alien_defs[CD_ASTEROID].flags = FL_WEAPCO | FL_NOBANTER;
 
 	alien_defs[CD_ASTEROID2].classDef = CD_ASTEROID2;
@@ -564,6 +642,9 @@ void alien_defs_init()
 	alien_defs[CD_ASTEROID2].collectChance = 25;
 	alien_defs[CD_ASTEROID2].collectType = P_ORE;
 	alien_defs[CD_ASTEROID2].collectValue = 1;
+	alien_defs[CD_ASTEROID2].collectTypeOriginal = P_ORE;
+	alien_defs[CD_ASTEROID2].collectValueOriginal = 1;
+	alien_defs[CD_ASTEROID2].score = 0;
 	alien_defs[CD_ASTEROID2].flags = FL_WEAPCO | FL_NOBANTER;
 
 	// Escort
@@ -581,6 +662,9 @@ void alien_defs_init()
 	alien_defs[CD_ESCORT].collectChance = 100;
 	alien_defs[CD_ESCORT].collectType = P_ANYTHING;
 	alien_defs[CD_ESCORT].collectValue = 100;
+	alien_defs[CD_ESCORT].collectTypeOriginal = P_ANYTHING;
+	alien_defs[CD_ESCORT].collectValueOriginal = 100;
+	alien_defs[CD_ESCORT].score = 450;
 	alien_defs[CD_ESCORT].flags = FL_WEAPCO;
 
 	// Mobile Ray Cannon
@@ -598,6 +682,9 @@ void alien_defs_init()
 	alien_defs[CD_MOBILE_RAY].collectChance = 75;
 	alien_defs[CD_MOBILE_RAY].collectType = P_ANYTHING;
 	alien_defs[CD_MOBILE_RAY].collectValue = 100;
+	alien_defs[CD_MOBILE_RAY].collectTypeOriginal = P_SHIELD;
+	alien_defs[CD_MOBILE_RAY].collectValueOriginal = 2;
+	alien_defs[CD_MOBILE_RAY].score = 1000;
 	alien_defs[CD_MOBILE_RAY].flags = FL_WEAPCO;
 
 	// Rebel Carrier
@@ -615,6 +702,9 @@ void alien_defs_init()
 	alien_defs[CD_REBELCARRIER].collectChance = 0;
 	alien_defs[CD_REBELCARRIER].collectType = P_SHIELD;
 	alien_defs[CD_REBELCARRIER].collectValue = 0;
+	alien_defs[CD_REBELCARRIER].collectTypeOriginal = P_SHIELD;
+	alien_defs[CD_REBELCARRIER].collectValueOriginal = 0;
+	alien_defs[CD_REBELCARRIER].score = 0;
 	alien_defs[CD_REBELCARRIER].flags = FL_FRIEND;
 
 	// Pluto Boss
@@ -629,9 +719,12 @@ void alien_defs_init()
 	alien_defs[CD_PLUTOBOSS].weaponType[1] = W_MICRO_ROCKETS;
 	alien_defs[CD_PLUTOBOSS].chance[0] = 50;
 	alien_defs[CD_PLUTOBOSS].chance[1] = 2;
-	alien_defs[CD_PLUTOBOSS].collectChance = 0;
+	alien_defs[CD_PLUTOBOSS].collectChance = 100;
 	alien_defs[CD_PLUTOBOSS].collectType = P_ANYTHING;
 	alien_defs[CD_PLUTOBOSS].collectValue = 1000;
+	alien_defs[CD_PLUTOBOSS].collectTypeOriginal = P_SHIELD;
+	alien_defs[CD_PLUTOBOSS].collectValueOriginal = 0;
+	alien_defs[CD_PLUTOBOSS].score = 1000;
 	alien_defs[CD_PLUTOBOSS].flags = FL_WEAPCO | FL_NOBANTER;
 
 	// Pluto Boss Barrier
@@ -649,6 +742,9 @@ void alien_defs_init()
 	alien_defs[CD_BARRIER].collectChance = 100;
 	alien_defs[CD_BARRIER].collectType = P_ANYTHING;
 	alien_defs[CD_BARRIER].collectValue = 25;
+	alien_defs[CD_BARRIER].collectTypeOriginal = P_ANYTHING;
+	alien_defs[CD_BARRIER].collectValueOriginal = 25;
+	alien_defs[CD_BARRIER].score = 1000;
 	alien_defs[CD_BARRIER].flags = FL_WEAPCO | FL_NOFIRE | FL_NOBANTER;
 
 	// Neptune Boss
@@ -666,6 +762,9 @@ void alien_defs_init()
 	alien_defs[CD_NEPTUNEBOSS].collectChance = 100;
 	alien_defs[CD_NEPTUNEBOSS].collectType = P_ANYTHING;
 	alien_defs[CD_NEPTUNEBOSS].collectValue = 1000;
+	alien_defs[CD_NEPTUNEBOSS].collectTypeOriginal = P_ANYTHING;
+	alien_defs[CD_NEPTUNEBOSS].collectValueOriginal = 25;
+	alien_defs[CD_NEPTUNEBOSS].score = 1000;
 	alien_defs[CD_NEPTUNEBOSS].flags = FL_WEAPCO | FL_NOBANTER;
 
 	// Mobile Shield
@@ -683,6 +782,9 @@ void alien_defs_init()
 	alien_defs[CD_MOBILESHIELD].collectChance = 100;
 	alien_defs[CD_MOBILESHIELD].collectType = P_ANYTHING;
 	alien_defs[CD_MOBILESHIELD].collectValue = 25;
+	alien_defs[CD_MOBILESHIELD].collectTypeOriginal = P_ANYTHING;
+	alien_defs[CD_MOBILESHIELD].collectValueOriginal = 25;
+	alien_defs[CD_MOBILESHIELD].score = 250;
 	alien_defs[CD_MOBILESHIELD].flags = FL_WEAPCO | FL_NOFIRE | FL_NOBANTER;
 
 	// Firefly
@@ -700,6 +802,9 @@ void alien_defs_init()
 	alien_defs[CD_FIREFLY].collectChance = 100;
 	alien_defs[CD_FIREFLY].collectType = P_ANYTHING;
 	alien_defs[CD_FIREFLY].collectValue = 250;
+	alien_defs[CD_FIREFLY].collectTypeOriginal = P_ANYTHING;
+	alien_defs[CD_FIREFLY].collectValueOriginal = 250;
+	alien_defs[CD_FIREFLY].score = 500;
 	alien_defs[CD_FIREFLY].flags = FL_WEAPCO | FL_NOBANTER;
 
 	// Uranus Boss
@@ -717,6 +822,9 @@ void alien_defs_init()
 	alien_defs[CD_URANUSBOSS].collectChance = 100;
 	alien_defs[CD_URANUSBOSS].collectType = P_ANYTHING;
 	alien_defs[CD_URANUSBOSS].collectValue = 500;
+	alien_defs[CD_URANUSBOSS].collectTypeOriginal = P_ANYTHING;
+	alien_defs[CD_URANUSBOSS].collectValueOriginal = 250;
+	alien_defs[CD_URANUSBOSS].score = 500;
 	alien_defs[CD_URANUSBOSS].flags = FL_WEAPCO | FL_NOBANTER;
 
 	// Uranus Boss Wing 1
@@ -734,6 +842,9 @@ void alien_defs_init()
 	alien_defs[CD_URANUSBOSSWING1].collectChance = 100;
 	alien_defs[CD_URANUSBOSSWING1].collectType = P_ANYTHING;
 	alien_defs[CD_URANUSBOSSWING1].collectValue = 250;
+	alien_defs[CD_URANUSBOSSWING1].collectTypeOriginal = P_ANYTHING;
+	alien_defs[CD_URANUSBOSSWING1].collectValueOriginal = 250;
+	alien_defs[CD_URANUSBOSSWING1].score = 500;
 	alien_defs[CD_URANUSBOSSWING1].flags = FL_WEAPCO | FL_IMMORTAL | FL_DAMAGEOWNER;
 
 	// Uranus Boss Wing 2
@@ -751,6 +862,9 @@ void alien_defs_init()
 	alien_defs[CD_URANUSBOSSWING2].collectChance = 100;
 	alien_defs[CD_URANUSBOSSWING2].collectType = P_ANYTHING;
 	alien_defs[CD_URANUSBOSSWING2].collectValue = 250;
+	alien_defs[CD_URANUSBOSSWING2].collectTypeOriginal = P_ANYTHING;
+	alien_defs[CD_URANUSBOSSWING2].collectValueOriginal = 250;
+	alien_defs[CD_URANUSBOSSWING2].score = 500;
 	alien_defs[CD_URANUSBOSSWING2].flags = FL_WEAPCO | FL_IMMORTAL | FL_DAMAGEOWNER;
 }
 
@@ -1760,6 +1874,7 @@ Fill in later...
 void alien_destroy(Object *alien, Object *attacker)
 {
 	int r;
+	int collect_type, collect_value, value;
 
 	audio_playSound(SFX_EXPLOSION, alien->x, alien->y);
 
@@ -1785,6 +1900,15 @@ void alien_destroy(Object *alien, Object *attacker)
 		if (attacker == &player)
 		{
 			game.totalKills++;
+			if (game.difficulty == DIFFICULTY_ORIGINAL)
+			{
+				if (game.area != MISN_INTERCEPTION)
+				{
+					game.cash += alien->score;
+					game.cashEarned += alien->score;
+				}
+			}
+
 			if (CHANCE(1 / 16.) && (alien->flags & FL_WEAPCO) &&
 				(!(alien->flags & FL_NOBANTER)))
 			{
@@ -1823,18 +1947,27 @@ void alien_destroy(Object *alien, Object *attacker)
 
 	if (CHANCE(alien->collectChance / 100.))
 	{
-		int value;
+		if (game.difficulty == DIFFICULTY_ORIGINAL)
+		{
+			collect_type = alien->collectTypeOriginal;
+			collect_value = alien->collectValueOriginal;
+		}
+		else
+		{
+			collect_type = alien->collectType;
+			collect_value = alien->collectValue;
+		}
 
 		if (CHANCE(1 / 10.))
-			alien->collectValue *= 2;
+			collect_value *= 2;
 
-		while (alien->collectValue > 0)
+		while (collect_value > 0)
 		{
 			value = RANDRANGE(10, 100);
-			if (value > alien->collectValue)
+			if (value > collect_value)
-				value = alien->collectValue;
+				value = collect_value;
-			collectable_add(alien->x, alien->y, alien->collectType, value, MAX(600, 2 * alien->collectValue));
+			collectable_add(alien->x, alien->y, collect_type, value, MAX(600, 2 * collect_value));
-			alien->collectValue -= value;
+			collect_value -= value;
 		}
 	}
 

src/defs.h

@@ -66,7 +66,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #define Y_VIEW_BORDER 100
 #define CAMERA_MAX_SPEED 3.
 #define MAX_HOMING 20
-#define MAX_DOUBLE_HOMING 15
+#define MAX_DOUBLE_HOMING (game.difficulty != DIFFICULTY_ORIGINAL ? 15 : 10)
 #define MAX_MICRO_HOMING 10
 #define RAY_DAMAGE_DELAY 10
 

src/game.cpp

@@ -339,9 +339,6 @@ static void game_doCollectables()
 				switch(collectable->type)
 				{
 					case P_CASH:
-						if (game.difficulty == DIFFICULTY_ORIGINAL)
-							collectable->value = collectable->value * 3 / 2;
-
 						game.cash += collectable->value;
 						game.cashEarned += collectable->value;
 						sprintf(temp, "Got $%d ", collectable->value);

src/shop.cpp

@@ -125,7 +125,11 @@ static void adjustShopPrices()
 			shopItems[SHOP_PLASMA_MIN_RATE].price += shopItems[SHOP_PLASMA_MAX_RATE].price;
 	}
 
-	shopItems[SHOP_PLASMA_MAX_AMMO].price = (10 * (game.maxPlasmaAmmo - 75));
+	if (game.difficulty == DIFFICULTY_ORIGINAL)
+		shopItems[SHOP_PLASMA_MAX_AMMO].price = (5 * game.maxPlasmaAmmo);
+	else
+		shopItems[SHOP_PLASMA_MAX_AMMO].price = (10 * (game.maxPlasmaAmmo - 75));
+
 	shopItems[SHOP_ROCKET_MAX_AMMO].price = (25 * game.maxRocketAmmo);
 	
 	if (game.maxPlasmaOutput >= game.maxPlasmaOutputLimit)
@@ -664,7 +668,10 @@ static void buy(int i)
 				shopSelectedItem = -3;
 				return;
 			}
-			game.maxPlasmaAmmo += 25;
+			if (game.difficulty == DIFFICULTY_ORIGINAL)
+				game.maxPlasmaAmmo += 10;
+			else
+				game.maxPlasmaAmmo += 25;
 			break;
 
 		case SHOP_ROCKET_MAX_AMMO:
@@ -938,7 +945,10 @@ static void sell(int i)
 				shopSelectedItem = -1;
 				return;
 			}
-			game.maxPlasmaAmmo -= 25;
+			if (game.difficulty == DIFFICULTY_ORIGINAL)
+				game.maxPlasmaAmmo -= 10;
+			else
+				game.maxPlasmaAmmo -= 25;
 
 			while (player.ammo[0] > game.maxPlasmaAmmo)
 				sell(SHOP_PLASMA_AMMO);

src/structs.h

@@ -62,6 +62,10 @@ typedef struct Object_ {
 	int collectType; // What the Object is carrying
 	int collectValue; // What it is worth
 
+	int collectTypeOriginal; // collectType in Classic difficulty
+	int collectValueOriginal; // collectValue in Classic difficulty
+	int score; // Classic difficulty only; money earned by killing
+
 	unsigned long int flags; // Various flags for an Object
 
 	float x, y, dx, dy;