Rummikub is rummy played with numbered tiles instead of cards, and it has been one of the world's best-selling family games for over fifty years. You hold a rack of tiles and try to get rid of them all by forming groups (three or four of the same number in different colours) and runs (three or more consecutive numbers in one colour) on the table.
What lifts it above card rummy is that the table is communal: once tiles are down, anyone can rearrange them, splitting and rebuilding existing sets to make room for their own tiles — as long as every set on the table is still valid when their turn ends. That rule is where the tactical thinking comes from.
Form groups (same number, different colours) and runs (consecutive numbers, same colour) of at least three tiles. Your first meld must be worth 30 points or more. After that you can rearrange tiles already on the table to fit yours, as long as everything is valid at the end of your turn. First to empty their rack wins.
106: numbers 1 to 13 in four colours, twice over, plus two jokers.
Yes — tap to select and place tiles. It runs in any browser with nothing to install.