01
Crash: the curve that knows your bet
An honest crash round commits to its multiplier before anyone bets, and lets you verify that afterwards. A rigged one decides after. If your big rounds die early and your small ones ride, and the site cannot produce a pre-committed hash for both, the curve is watching your stake.
02
Dice: seeds you are not allowed to set
Provably fair dice means you supply a client seed and can change it whenever you like. A site that generates both seeds, or quietly resets yours after a win, has removed the only part of the system that was protecting you.
03
Mines: boards drawn after the click
The mine positions should be fixed when the board is created. If they are not, the site can place a mine wherever you click on the tile that would have cashed you out. A fair mines game can prove the layout predates your first pick.
04
Cases: the odds nobody publishes
A case opening without published, verifiable drop rates is a raffle with the host holding the ticket. If the rare item has no stated probability, there is no probability — there is whatever the site decides today.
05
Coinflip: an opponent that is the house
Player-versus-player flips are only fair if the other player exists. Instant matching at any stake, at any hour, against names that never appear anywhere else, usually means you are flipping against the site itself.
06
Any game: the withdrawal that needs one more wager
The most common rig is not in the game at all. You win, and the payout is gated behind wagering that was never mentioned, sized so you will lose it back first. Read what clearing a bonus actually requires before you accept one.