Connections

Goal

You get 16 flags. Find four groups of four that go together. Each group shares a theme.

You can submit four wrong groups. After that, the round ends. A group only counts if all four flags match the same theme.

On the board

Tap four tiles, then Submit. Correct groups are removed and the theme is shown; work through the rest until all four are found.

Tap four flags, then submit your guess.

If you are right, those flags leave the board and the theme is shown. Keep going until all four groups are found.

Sure bets first: Lock obvious groups before you touch tiles that could belong elsewhere.
Ambiguous flags: If one could fit two themes, set it aside and clear easier groups first.