Reimu Red-2 Shot Desync

Specifications

  • Versions: 1.00a
  • Difficulty: Easy - Normal - Hard - Lunatic - Extra
  • Mode: Main game - Practice mode - Spell practice
  • Shottype: Reimu - Marisa

What happens

Using the Red-2 stone for the unfocus stone as Reimu might desync your game. This only affects stages after Stage 1: Stages 2 through 6. In other words, only main game credits are counted: stage practice, spell practice, and Extra are not affected.

An in-game screenshot of two Reimu Red-2's with her amulets being at different positions.
Figure 1: Two screenshots of Reimu with her unfocus shot. This shot cycles on a period of 120 frames. The left image shows a narrow gap between Reimu's amulets while the right image shows a wide gap between Reimu's amulets.

How it happens

There are two different ways to desync with Reimu Red-2:

  1. If the player starts a Red-2 replay on a stage between Stage 2 and Stage 6, the replay will desync. Playing the replay starting from Stage 1 might play the replay correctly.
  2. However, if while playing the game, the player skipped through the result screen with the Red-2 stone out at the end of a stage, the replay desyncs even when starting from Stage 1.

Why it happens

Reimu Red-2's shot oscilates on a period of T = 120f with T incrementing by 1 every game frame. (for technical readers, its value can be read at *(int*)(*(int*) th20.exe + 1BA568 + 4) + 0x22B4 + 0x12580 + 4. This T value is not saved in the replay. This has the following consequences:

  1. Because T is not saved in the replay, when the game initialises the selected stage, T is initiallized to 0. This is almost always going to be wrong if you select Stages 2 through 6 in your replay menu.
  2. When the replay enters the result screen, the replay fully waits out the 5 seconds before the stage transition despite that delay having been skipped in the run. The T value continues to increment throughout those 5 seconds, causing it to be off-sync from what it is supposed to be.

Because in both cases the T value is very likely to not correspond with your original T value, replays using the wide Red-2 as Reimu have a high chance of desyncing.

Replays

  • Replay Nylilsa by "Nylilsa". Normal, ReimuR2, 1.00a. 「September 13, 2025」. Download link (Note: Stage 2 always desyncs regardless of how it is initialized.)

Videos

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All Fossilized Wonders pages:
Point Item Value Overflow Glitch · Player Hitbox Bug · Nina's Survival Hurtbox · Yellow-2 Shot Desync · Reimu Red-2 Shot Desync · Stone Timer Desync · Uninitialized ANM · Nina Resolution Desync · Player Option Position Desync · Persisting Bombs · Wrong bullet off-set · Restarting replay desync · Persisting Screen Shaking · No Bombs in Practice Mode · -nan(ind) Slowdown · Yellow-1 Shot Persisting Damage · Equipping Un-equippable Stones · Persisting Overlay · Replays Menu Wrong Stage Number · Persisting Stone Selection Menu · (null) Column in Player Replays · Replay BGM ErrorStone Spawning Error
All Desync-related pages:
All Shottype-related pages:
All Stage transition-related pages: