Known bugs, glitches, exploits, whatever you want to call it in the Boktai games. These should eventually be documented somewhere

Boktai 1

Muspell can become tripped out and endlessly cycle between rolling into a ball/unrolling (Raphi)
Softlock in Sabata's arena in Dark Castle: Defeat sabata, reenter the arena using the north exit, save & quit ("We have retreat glitch at home") (beige)
AST key duplication
indexed-ptr u16 (Raphi)
Cutscene skips (e.g. Sol City, that other dungeon)
Diagonal movement tech (e.g. Sol City)
Water Demon's Cage skip
Stopping on ice (shenef)
Footsteps can become inaudible when consuming a speed nut while walking into lava (Raphi)

Boktai 2

Clocktower check is bugged in the Japanese version (Raphi)
Softlock when trying to start a purification if you got the punish room when loading into the piledriver map (mttkm)
Puddle knockback storage (beige)
Dream Avenue loading zone glitch with Solar Gun knockback
- Also works in the Remains desert
Garbage text in Treasury sign (aishituzi)

STR from equipment doesn't work (beige)
Footnotes in Inventory (Boktai 3)
White Forest: After purifying Sabata, his shadow is visible on top of the coffin sprite even before he emerges from it
Purification can be completed instantly by summoning the piledriver, clearing the silver rank of the Arena and starting the purification (NG+ only due to Arena only being available after clearing the game once) (found by 苓燐, reproduced by beige) (link)
Being hit by Ratatosk's bind attack during the TRC change animation allows using TRC without consuming the TRC gauge (beige) (link)
Solar Trap magic can sometimes stop working after a block has passed over it (beige) (link)

Command swap glitch
- Terennial swap glitch
- Data abort when failing terennial swap glitch
- Trance swap glitch (can either stop time or softlock) (Raphi)