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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)

  • r = rand() % 0xA2 (0..161).
  • Points (id 1) if r <= 12 (13/162).
  • Energizer (id 2) if r == 13 AND (rand() & 0x3f) == 0 (1/10368).
  • Otherwise, fall through to the bucketed ids 3..14 using esi = r - 0x0d and a 10-step loop. The loop repeats until an id is assigned; this produces the weights in the table below.

Distribution (per bonus pick, all bonuses enabled)

ID Bonus Weight (out of 10368) Chance Percent
1 Points 832 13/162 8.0247%
2 Energizer 1 1/10368 0.0096%
3 Weapon 1343 1343/10368 12.9533%
4 Weapon Power Up 1280 10/81 12.3457%
5 Nuke 1152 1/9 11.1111%
6 Double Experience 640 5/81 6.1728%
7 Shock Chain 640 5/81 6.1728%
8 Fireblast 640 5/81 6.1728%
9 Reflex Boost 640 5/81 6.1728%
10 Shield 640 5/81 6.1728%
11 Freeze 640 5/81 6.1728%
12 MediKit 640 5/81 6.1728%
13 Speed 640 5/81 6.1728%
14 Fire Bullets 640 5/81 6.1728%

Reroll gates

bonus_pick_random_type rerolls until it finds an allowed type (up to 0x64 attempts, then falls back to id 1 / Points). The distribution above is renormalized when these gates are active:

  • bonus_meta_enabled disables id 0; all other ids are enabled in init.
  • 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 when bonus_state contains a type 0x0e entry with state 0 (see the scan at the top of bonus_pick_random_type).

  • In quest mode (config_blob[0x18] == 3), additional quest stage checks can suppress Nuke (5) and Freeze (11).