Chuukara Shisen is the one that allows you to play the rare chance times in Shisen-sho with high probability.
The tiles are generated completely at random, but if they do not meet the criteria, the tiles are re-generated, which is a grueling process that produces a high probability of a good deal.
at://did:web:gamesgamesgamesgames.games/games.gamesgamesgamesgames.game/3mgib7h25rg2d