Used all the different types of geo-charge on a level.

Used geo-charges 10 times on a single level.

Didn't let a single enemy reach the time machine throughout a level.

Installed weapons on all the tiles accessible on a level.

Complete all levels with 3 stars

Sell 500 towers

Fully upgrade 200 towers

Kill 1,000 enemies

Manually send 100 waves of enemies

Build 50 towers

Complete a level using only one rock.

Hit the King with a rock.

Used all the different types of geo-charge on a level.