Original bugs (rewrite)¶

The classic crimsonland.exe has a few behaviors that look like genuine bugs once you read the decompile and trace their gameplay impact.

In the rewrite, we fix these by default. For parity work and future differential testing, you can re-enable them with --preserve-bugs.

1) Bonus drop suppression: amount == current weapon id¶

Native behavior:

• In bonus_try_spawn_on_kill (0x0041f8d0), after spawning a bonus, the exe clears the spawned entry if either:
• there’s already another bonus of the same bonus_id on the ground (duplicate suppression), or
• bonus.amount == player1.weapon_id regardless of bonus type.

Why it’s likely a bug:

• For non-weapon bonuses, amount is usually the bonus metadata “default amount”, which lives in a different integer domain than weapon ids.
• This creates accidental “hard bans” where certain bonuses never drop while holding specific weapons, and it can also reduce the overall drop rate (the drop is canceled, not rerolled).

Examples of the accidental hard bans (native metadata):

• Reflex Boost (amount=3) while holding Shotgun (weapon_id=3)
• Fire Bullets (amount=4) while holding Sawed-off Shotgun (weapon_id=4)
• Freeze (amount=5) while holding Submachine Gun (weapon_id=5)
• Shield (amount=7) while holding Mean Minigun (weapon_id=7)
• Speed (amount=8) while holding Flamethrower (weapon_id=8)
• Weapon Power Up / MediKit (amount=10) while holding Multi-Plasma (weapon_id=10)

Rewrite behavior:

• Default: only suppress Weapon drops that match the current weapon id.
• With --preserve-bugs: re-enable the exe’s amount == weapon_id suppression rule for all bonus types.