Prison Pocket

Everyone else got one pocket for each hand. You got a third one, and nobody's asking where it is.

Pick up the Prison Pocket trinket before a run and you'll have a hidden pocket to stash one extra item in. It'll cost you a bit of score (-0.15 multiplier) since it's basically cheating, but hey, you'll have somewhere to put that piton when both hands are full.

Using it

Hold Focus, then tap Q or E (whichever pocket key you've got bound) to shove the item in that hand into the pocket, or pull it back out. Same keys the normal pockets already use — nothing new to learn, just an extra option while Focus is held.

Didn't pick the trinket this run? Nothing changes. No pocket, no new key behavior, business as usual.