21 cells arranged in a triangle. Players take turns placing numbers on empty cells.
Numbers
Each player has numbers 1–10. Every number is used exactly once. Pick a number, then tap a cell to place it.
The black hole
The last empty cell becomes the Black Hole. Any numbers placed adjacent to it score against their owner.
Winning
Add up your numbers that neighbour the Black Hole. Lowest score wins. So place big numbers far from the centre — or try to force your opponent's big numbers close.