In Gem TD, the towers you get are completely random. Start by building 5 random gems near the track and picking a gem to keep for the round.
If you build two of the same gems in one round, you can combine them to get a gem one quality level higher than the component gems. If you manage to build four of the same gems, you can combine them to get a gem two quality levels higher.
The quality levels are: Chipped -> Flawed -> Normal -> Flawless -> Perfect -> Great
At the beginning of the game, every gem you build will be a Chipped gem. By spending an increasing amount of minerals, you can increase this chance at your builder. Eventually you will even be able to build Perfect gems during the build phase!
Mazing is highly advised to do well in this game. Start by building a spiral of gems around one of the waypoints, and replacing the mazing rocks close to the center to get more powerful gems near the center of the maze. Over time you can come up with your own methods of creating an effective maze. The key is to maximize the amount of time your high-level combination gems spend attacking the enemies.
Every basic gem can be combined with two or three other specific gems to create a powerful combination gem. When you build all the parts of a combination, whether by chance during the build phase, or by saving each part one at a time during seperate waves, they will show a special animation and you can initiate the combine using any of the parts. The final gem will appear in place of the gem that used the "Special Combine" ability.
Gem TD has three game modes currently:
Classic Mode, where all players encounter each wave at the same time, and there are boss levels after waves 15, 30, and 50\\
Race Mode, where each player's spawns are independent, and it is a race to finish wave 50 in the shortest amount of time. There are no boss levels in Race Mode.\\
Survival Mode, where all gems do half damage. The challenge is to survive the longest!
Polish / Features
-48 Basic Gems, 8 types of gems each with different abilities (6 quality levels each)
-32 Combination Gems, each with its own model and abilities
-50 Waves of enemies each with its own separate model
-All custom missile arts and sounds
-5(!) different leaderboards to look at while your maze does its business
(lives and waves, player stats, combos & paths, tower damage, tower kills)
-Fully stocked tips menu/combo listing
-Dustin for helping test and picking out some awesome models for the special towers
-JademusSreg for helping me test at all hours of the night even though he claims to hate all TDs (hes even making one too! Who would have known?)
This map is currently published under the Tower Defense category