Make 24

Practice Train Survey

deck new sets

filter

⋯

fast if under s import progress (CSV)

0.00

weakest sets in this deck

how it works

Solvable? covers all 1820 sets (1362 solvable, 458 not): decide whether the set can make 24. Solve covers the 1362 solvable sets: find a solution.
Press any key (or tap) to turn the cards over; the timer starts then.
Solvable?: answer with → (solvable) or ← (unsolvable). It's checked for you, and any key deals the next set.
Solve: press any key when you have a solution. That stops the timer and shows every solution, so typing time doesn't count. Grade yourself with → (right) or ← (wrong).
There's no daily schedule: keep going as long as you like. The next set is the one you're weakest on, by recent accuracy and then by recent time. A set you just saw sits out for a while: a few turns after a miss, longer the more times in a row you get it right fast.
filter narrows the deck to sets that are easy to pick out: which ranks may appear, how many face cards (J Q K), and for Solve, the number of solutions (distinct, or a range of total written forms, where 4*6 and 6*4 count separately) and the strategy. Strategy can match the set's one canonical strategy, or any strategy one of its solutions uses. Your progress is kept for every set either way.
When every set that's available is one you currently get right and fast, a new set comes in, in the order you pick.
Progress is saved in this browser. Use export / import under ⋯ to back it up or move it to another device.