Guess the stack

Five questions a round, ten rounds, getting harder as you climb. A correct answer in round 7 is worth seven points, so the higher you go the faster your score grows.

The catch: after each round you choose to bank what you've earned or gamble it on the next one. Score fewer than 2 out of 5 in a round and you lose the lot. The first 2 rounds are a warm-up — you can't go out on those.

Start round 1