~ Mind the wind ~
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Take turns lobbing shells over the hill. The wind pushes every shot sideways the whole way, and each blast digs a hole, so the ground keeps changing. Phone: drag away from your cannon — the barrel follows your finger and the further you drag, the harder it fires. Let go to shoot, or let go right next to the cannon to change your mind. Computer: arrow keys, then space. In the 1 player game your damage is never repaired, so a scratch in round one still counts in round nine.