math ers

Slap the pile the instant the top cards match a pattern. Fastest correct slap takes the pile; a wrong slap burns a card to the bottom.

Card values — A = 1 · J = 12 · Q = 11 · K = 13 · rest face value.

• square — digits of the last 2+ cards concatenate to a perfect square (≥2 digits). 12,1 → "121" = 11²
• cube — same, a perfect cube. 2,7 → "27" = 3³
• arithmetic — top 3 are an arithmetic sequence, either direction. 2,4,6 · 5,5,5
• geometric — top 3 are a geometric sequence. 2,4,8
• fibonacci (mod 13) — each card is the previous two summed (wrapping at 13); run length set in settings. 2,3,5