Pick an island to claim it as your own before the competition starts.

Your armies grow over time on every island you control.

Move your army toward a rival island to attack, or toward your own to reinforce it.

Wipe out every rival army and occupy all islands to win the match.

Bigger islands grow armies faster, but they are also the first target for rivals.
Split your forces to press multiple islands at once, but don’t overextend and leave your own islands undefended.
Reinforcing an island you already own is often safer than opening a new front.
In Multi Player, check the free places on a room before joining, a nearly full room means the match will start soon.
You can move faster between connected islands, so claiming the islands along a route speeds up reinforcements and attacks further down the line.