![for the damaged coda bpm for the damaged coda bpm](https://i.ytimg.com/vi/PdEo5DIP2oc/maxresdefault.jpg)
If the player cannot do this, 157 BPM is the slowest tempo that does not require any exact-frame precision, which is viable only on Zone 4-3 and just after defeating Death Metal (or on any floor as Bolt). Theoretically, any character can use the Heal spell twice per floor when the music BPM is as low as 144 however, this requires two frame-perfect inputs on the half-beat which is extremely difficult.
![for the damaged coda bpm for the damaged coda bpm](https://musescore.com/static/musescore/scoredata/g/e9ea6f50636f03ffde86a405905e6329d6cdbc98/score_0.png)
Without custom music, this can only be done as Bolt. If the BPM of the music is at least 267, the Heal spell can be used twice without needing any sub-beat inputs.Under certain conditions, this allows for the above trick to be used twice per floor: While two valid inputs can be made with only three frames (0.05 seconds) in between, three valid inputs require at least one full beat plus two frames between the first and last input. If the player is bat form Nocturna at the end of a floor, the same trick can be used in a near identical manner to transform back into human form without taking damage. If the BPM of the music is at least 134, there are fewer than 27 frames between beats and the above trick can be performed without needing any sub-beat inputs.Deliberately moving onto the stairs late while using the Heal spell early allows the above trick to be performed on any floor.Normally this is not possible, since after the player makes the input to move onto the stairs, they must wait a beat before being allowed to input again, and by then the next floor transition would have already completed. Thus, if the player can use the Heal spell while still on the stairs, they will not take any damage even from blood magic, and effectively gain half a heart of health for free. Transition to the next floor in approximately 27 frames (~0.45 seconds).Ignore all damage while the player is on the stairs (except for the Vow of Poverty).When the player steps on the stairs, the game is programmed to: (Normally, the second input would be rejected for being too close to the first instead of a beat after the first, causing a missed beat.) As a result, if one beat is made as late as possible, and the very next beat is made as early as possible, the game will recognize two valid inputs in rapid succession. The player may be up to half a beat early or half a beat late on any input. 5 Getting killed by the Food Shopkeeperįundamentally, the reason why sub-beat mechanics exist in the first place is due to the game's wide timing windows.4 Trapdoors as Aria + Damage prevention.