▶ The Edu Casino · 18+

Adults only

The Edu Casino is for adults (18+). It uses fictional chips only — no real money, nothing to buy, nothing to win.

Kelly Bet Sizer

Six made-up coin tables: some give you an edge, some are fair, some lean against you. Pick the share of your fake chips to stake on every flip, then watch 40 flips next to the Kelly stake and double Kelly. Simulate hundreds of seasons to see why over-betting ends in ruin.

6 tables
Kelly criterion

How to play

Read the coin. Each table shows the win chance p and the payout b to 1. Every table starts with 1,000 fake chips.
Size the stake. Pick the share of your chips to bet on each flip, from 0% (walk away) to 100%.
Watch the swings. 40 flips play out for you, for Kelly and for double Kelly on the same coin.
Score. Up to 100 per table: half Kelly to full Kelly scores 100. With no edge, only 0% scores full marks.

Quick tips

No edge, no bet. When b × p − q is zero or negative, the best stake is nothing. Walking away scores full marks.
Half Kelly is sound. Half the Kelly stake keeps most of the growth with far smaller swings. It scores full marks too.
Over-betting hurts more. Past Kelly, growth falls; around double Kelly it's gone, and losing streaks get brutal.
Never all in. Staking 100% means one loss ends the table.
Trust the long run. 40 flips are mostly luck. The season simulator shows what each stake does over time.