How to play

• Destroy every alien in the wave before the formation reaches your line.
• The fewer aliens remain, the faster the whole formation moves.
• Bunkers block shots from both sides and wear away with every hit.
• The saucer crossing the top is worth a large bonus.
• Every fifth wave is a boss that takes many hits and fires in a spread.

Tips

• Clear a column from the outside in: it delays the moment the formation drops.
• Do not shoot through your own bunker — you are the one who opens the hole.
• The last two aliens move very fast; lead your shot instead of aiming at them.
• During a boss fight stay under it and strafe: the spread has gaps near the centre.