6561

You can slide the hexagons in six directions. If three hexagons are in one line they become one bigger hexagon. The goal is reaching a hexagon with 6561 or gain as much as possible points. The game is over if there is no more space anymore.

It's a game like 2048 but with one more dimension.
For all who want to learn the row of 3^n

Web version: https://moritz-riedel.de/6561