Bonus drop rates¶

These rates come from bonus_pick_random_type (0x412470) and describe the bonus type distribution once a bonus is about to spawn. They do not include the per-kill spawn gate in bonus_try_spawn_on_kill (0x41f8d0).

Picker logic (summary)¶

Source: decomp/1.9/crimsonland/gameplay/bonus_pick_random_type.cpp:16-45.

• bucket = rand() % 0xA2 + 1 (1..162).
• Points (id 1) if bucket <= 13 (13/162).
• bucket == 14 draws rand() & 0x3f: Energizer (id 2) on 0 (1/10368), otherwise Weapon (id 3).
• bucket 15..134 map to ids 3..14 in steps of 10.
• bucket 135..162 (28/162) leave the id at 0. Entry 0 is disabled (bonus_reset_availability), so the pick is rerolled like any other blocked type. The loop does not wrap around to id 3.

Distribution (per bonus pick, all bonuses enabled)¶

Out of 162 × 64 = 10368 raw outcomes, 1792 reroll and 8576 assign a type. The chances below are per assigned pick.

Reroll gates¶

bonus_pick_random_type (decomp/1.9/crimsonland/gameplay/bonus_pick_random_type.cpp) rerolls until it finds an allowed type (giving up after 100 rerolls and returning id 1 / Points). The distribution above is renormalized when these gates are active:

• bonus_meta_table[].enabled: bonus_reset_availability enables every id except 0.
• Shock Chain (7) is rerolled if shock_chain_links_left > 0.
• Freeze (11) is rerolled if bonus_freeze_timer > 0.
• Shield (10) is rerolled if either player shield timer is active.
• Weapon (3) is rerolled if perk_id_my_favourite_weapon is owned.
• MediKit (12) is rerolled if perk_id_death_clock is owned.

• Weapon (3) is also rerolled while a Fire Bullets (14) drop with state 0 is in bonus_pool (has_fire_bullets_drop, from the scan at the top of the function).

• In quest mode (config_blob.game_mode == GAME_MODE_QUEST):

• Nuke (5) is rerolled in 2.10, 4.10, and 5.10, and also in 3.10 on hardcore.
• Freeze (11) is rerolled in 4.10, and also in 2.10 on hardcore.