Gem TD is a tower defense game based on chance. Start by placing 5 random gems on the board and then pick one. The remaining gems turn into rocks, which are useful for mazing. Each wave, a group of monsters travel to 7 waypoints and then to the end. Your goal is to defeat all these monsters before they reach the end. You can maze around waypoints to increase the time your gems attack monsters. Use your bounty from clearing each wave to upgrade your Gem Chance for placing higher quality gems. Combine these placed gems into more powerful special gems and slates! Special Gems have an assortment of abilities to aid you in different situations. Slates can be moved anywhere and allow you to damage monsters as they get near or walk over them.