Daily perfect clear game · PC trainer

Field notes

stackdle.io is a perfect clear game. Every day there are three PC puzzles, the same for everyone, and the Perfect clear tab lets you practise as many as you like with a solver beside you. New to PCs? Start with the perfect clear guide.

Finesse

  • Finesse means reaching a placement with the fewest key presses. A held DAS press counts as one input, same as a tap.
  • Any placement on a flat board takes at most 3 inputs here. If you need 4, there is a shorter route.
  • Going to a wall? Hold DAS once instead of tapping. One column off the wall? DAS, then tap back.
  • Rotate the short way: one ↺ instead of three ↻, and the 180 key instead of two of either.
  • Vertical I, S and Z have two resting columns per orientation. ↻ and ↺ land one column apart, so pick the one that saves a tap.
  • Learn it slow. Clean inputs at 1 PPS turn into clean inputs at 3 PPS; sloppy ones don't.

Perfect clears

  • A 4-line PC fills 40 cells, which is exactly 10 pieces. With hold you choose those 10 from the first 11 you see.
  • Never cover a hole. Any empty cell under a block means that row can't clear.
  • Split the field into regions mentally. Each enclosed region must hold a multiple of 4 cells.
  • Keep I pieces and O pieces flexible; they fix bad parity late. T, S and Z are the ones that create awkward shapes.
  • After a PC, 10 pieces have been used, so the next PC starts 3 pieces into a bag. There are 7 bag positions; practise each with the PC # selector.
  • The solver tries straight drops first, then tucks and SRS spins. Numbers on the full solution show the order; a highlighted label means hold first.