Reach 10000 points to earn your first bonus city (variant 1 or 2)

Reach 20000 points to earn your second bonus city (variant 1 or 2)

Reach 30000 points to earn your third bonus city (variant 1 or 2)

Reach 40000 points to earn your fourth bonus city (variant 1 or 2)

Reach 50000 points to earn your fifth bonus city (variant 1 or 2)

Reach 10000 points to earn your first bonus city (variant 3 or 4)

Reach 20000 points to earn your second bonus city (variant 3 or 4)

Reach 30000 points to earn your third bonus city (variant 3 or 4)

Reach 40000 points to earn your fourth bonus city (variant 3 or 4)

Reach 50000 points to earn your fifth bonus city (variant 3 or 4)

Complete wave 1 with 10 missiles or less and all cities intact (variant 1 - 4)

Complete wave 2 without increasing y-axis or losing any of the 6 cities (variant 1 - 4)

Complete wave 3 at y-axis min, saving cities at the last possible moment while not losing any of the 6 cities (Variant 1 - 4)

Complete wave 4 with 18 or more anti-ballistic missiles remaining and without losing any of the 6 cities (variant 1 - 4)

Complete wave 5 and all prior waves without losing a city (variant 1 - 4)

Complete wave 6 with 15 or more anti-ballistic missiles remaining and without losing any of the 6 cities (variant 1 - 4)

Look out for smart cruise missles and complete the 7th wave without losing any of the 6 cities (variant 3 or 4)

Complete wave 13 (variant 1 or 2)

Complete wave 13 (variant 3 or 4)

Start variant 13 and use up all your missiles without taking out an IPBM for a programmer secret