Strip off the casino chrome and the game called Mines is a very old idea in a new coat: a grid, hidden hazards, and a nerve test. The format descends from the pencil-and-paper minefield puzzles a generation of people played on office computers, and if you want the lineage, minesweepers.org.uk traces it far better than any betting site will. Spribe's contribution was to bolt a cash-out button onto the grid...
Mines
You can read about a mines bet for thirty seconds and understand the whole thing: pick a tile, hope for a gem, decide when to walk away. Then you play it and find out the rules were never the difficult part. The difficult part is the click you shouldn't take. The Grid Deletes the Only Skill You Had Minesweeper handed you numbers. Deduction. An actual reason to prefer one square over another. The casino...