biggimac42's cool video and explanation:
You can also swap your strength boots with another boots over and over. Combined with gi-glass swap, boss black chest always give you heavyglass (or gold pile if there's no item in the pool).
You can use "weapon conjuring failed!" to swap faster.
You can use this to open T2/T3 cracked wall without spending bombs.
When you use throw/item, game doesn't update your prevpos, and minotaur chases your prevpos, but in this case, without charging.
If you use spell, minotaur will charge at your prevpos instead. (Spell doesn't update "hasMoved" flag, unlike item/throw.)
Especially useful on Nocturna. You can wait for song end on bat form to avoid greed drain.
You can get multiple heals from pixie on:
Single Tempo: ~2 (really difficult, "letting the pixie move into player" makes it easier.)
Bolt: ~3
Bolt + Tempo Up: ~4
Bard/Transplant: ~(to full health)
Lep doesn't drop gold pile upon death on Coda/Monk, which enables you to get lucky charm (without using earth to remove gold pile below) by following means:
Sub-beat kill with 2~3 damage (easy on Coda)
Make a dead-end hole
Deal 4+ damage (weapon, bomb, earth, holy water, pulse etc.)
Place a bomb on the 5th beat after making a pile
Use Range (weapon, fireball, throwing stars)
Freeze/Snowbro
Bonce Trap
Axe/Rapier
This can be useful on non-phasing scores too, since it digs 5 walls with 1 blooddig.