← → or A D move · ↑ W X rotate clockwise · Z rotate the other way
↓ soft drop · Space hard drop · C or Shift hold · M mute
On a phone, swipe the cart or use the buttons. A fast swipe down slams the bag.
Tiers: 100 / 300 / 500 / 800 × level, with a balance multiplier. Balanced lock: +60 × level. Tipping lock: −50 × level. Tight stack: more points for faces touching the bed or other bags. Every 10 tiers a tug pulls that cart away and the next one rolls in. Best load is kept on this device.