This game supports general arithmetic and cognitive practice. It does not diagnose, treat, or replace professional medical or rehabilitation advice.
How to play
Tap a poker card, then an operator or parenthesis, to build an expression. Use all four cards exactly once and make 24. Aces count as 1, while Jacks, Queens, and Kings count as 11, 12, and 13. Calculations use exact fractions.
Choose a difficulty
- Easy: simpler integer puzzles, 3 minutes, and free solution hints.
- Medium: mixed operations with cards up to 10, 90 seconds, and a 10-point hint cost.
- Hard: all card ranks with division-based puzzles, 45 seconds, and a 20-point hint cost.
You can undo one step, clear the expression, request a new puzzle, or reveal one solution. Stop if play causes headache, distress, dizziness, or unusual fatigue.
Possible general benefits
Mental arithmetic can practice attention, working memory, planning, and flexible problem solving. A game score does not measure cognitive health and improvement in the game does not prove a clinical benefit.