Jetlagidee

Off by One Error

Jetlagidee - Beta Test

Round 0 / 10 Points 0 Time 10:00

You get 10 rounds and 10 minutes. Use all four cards to make 23 or 25 for 5 points, or 22 / 24 / 26 for 3, or 21 / 27 for 1. Pass any round you can’t crack.

How to play

Each round deals four cards numbered 1–13. Build one expression that uses all four cards exactly once with + − × ÷ and parentheses. Your answer is rounded to the nearest whole number for scoring.

  • 23 or 25 — 5 points (the “off by one” jackpot).
  • 22, 24 or 26 — 3 points.
  • 21 or 27 — 1 point.
  • Anything else — 0 points.

You have 10 minutes total for all 10 rounds. Click Pass to skip a stumping hand — but once you submit or pass a round, you can’t go back to it. The live preview shows what your expression equals as you type; the cards dim once they’ve been used.