Tutorial:

Drag the cards from your hand onto the battlefield and place them on the left side.

You can play one creature and one treasure card each turn. When you want to play them, drag the cards from your hand to the desired target and just let go :)

Each creature on the field has a countdown. Once it reaches zero it attacks the opposing row or its ability triggers.

Be mindful of your placements as you can't change them later!

Your goal is to reduce the diver's hitpoints down to zero. You do that by killing the creatures on the enemy's board, or making a direct attack if the opposing row is empty.