Slots with a gamble feature
After a win the game offers to double it by guessing a card’s colour or suit — and to lose the lot if the guess is wrong. Mathematically it is a clean 50/50 with no house cut, making it the only part of a slot where the casino holds no edge at all. It also spikes variance instantly, and several regulators ban it outright, so the button is missing from many builds of the very same game.
How this slice was built
54 games out of the 996 in the catalog. The industry has no shared vocabulary for mechanics: studios describe the same thing in different words, so this list is assembled from a normalised set of spellings found in provider specifications — gamble, gamble feature, risk game, risk game (double or nothing), risk game (double-up gamble), double up. If a game uses the mechanic but the provider never listed it, it will not show up here.
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