Gem TD

Gem TD is a tower defense map that originated from Warcraft 3. It features a unique maze, a challenging difficulty curve and a high degree of replayability. Build your gems and stones to protect the castle. 50+ waves of enemies will attack your castle.

Gameplay
Players must defend their Gem Castle by constructing a long winding maze that creeps will follow and allow for their towers to do maximum damage before they reach the Gem Castle. Waves get increasingly difficult as the game progresses and each wave will have different skills that add to the challenge (magic immune, ability to disarm, flying, physical immune, etc). In response, players can combine gems and towers to increase their damage. The game consists of a build phase and an attack phase.

Build Phase
Players must place 5 gems during the build phase and then pick only one gem that will remain while the rest will be turned into stone. The player must have a balance between building the maze itself and having gems in the right place in order to maximize their effectiveness. Each gem you place will be random unless you have skills that increase the chances for certain types of gems. To finish the build phase, players must select one of the options below:
 * SELECT (Check) Keep the selected gem only
 * REMOVE (Stone) Remove the stone
 * MERGE (^) Replace the selected gem with the same type one level higher
 * MERGE (^^) Replace the selected gem with the same type two levels higher
 * COMBINE (Tower)
 * If you get the right combination of gems and towers you can combine them to create a stronger tower with special effects depending on which gem/tower combination you got
 * If you happen to get all 3 gems required build a tower during a single building phase you can instantly build the tower
 * DOWNGRADE (Gem) Downgrades the gem to a random lower quality for 200 gold

Attack Phase
The attack phase involves creeps passing through five checkpoints in order around the map before reaching the Gem Castle. They take shortest path available between the checkpoints. Towers or gems that do the most damage in a single round are awarded a MVP bonus which boosts their damage and decreases magic resistance (10% and -10% respectively) of nearby enemies. When a gem or tower receives the max amount of MVP's (10 MVP awards) they receive a special aura with a range of 600 (radius of 2 tiles) that increases damage of nearby towers and gems by 75%. Players can direct the towers manually or tell them to stop in order to focus on certain enemies or to manage which towers get MVP bonuses.

Gems
Gems come in various types and have a level 1-6.

Towers
{| class="wikitable sortable" ! Name !! Classification !! Ability !! Range !! Damage !! Attack Speed ! colspan="6" |
 * Silver || Basic || Slow 2 Decreases enemy's movement speed by 90. || 600 || 25 || 170 (1.00s)
 * Silver Knight|| || Cleve 3 Deals 50% pure damage around 400 range of the target. Slow 3 Decreases enemy's movement speed by 120. || 700 || 60 || 213 (0.80s)
 * Malachite || Basic || Split 1 Attacks up to 3 enemy's at the same time. || 600 || 15 || 340 (0.50s)
 * Huge Malachite || || Split 1 Attacks up to 3 enemy's at the same time. || 700 || 50 || 340 (0.50s)
 * Asteriated Ruby || || Burn 1 Deals 60 damage every second to nearby enemies. || 600 || 0 || 340 (0.50s)
 * Volcano || || Burn 2 Deals 320 damage every second to nearby enemies. || 600 || 0 || 340 (0.50s)
 * Quartz || || Anti-Fly 1 Flying enemies armor decreased by 10 and movement speed decreased by 150. || 500 || 15 || 283 (0.60s)
 * Charming Lazurite || || Anti-Fly 2 Flying enemies armor decreased by 10 and movement speed decreased by 250 and magic resistance is decreased by 50. || 800 || 20 || 283(0.60s)
 * Jade || || Poison 4 Enemies take 8 damage per second. Lasts 5 seconds. || 800 || 10 ||340 (0.50s)
 * Lucky Chinese Jade || || Poison 5 Enemies take 16 damage per second. Lasts 5 seconds. Recover Attacks have a 1% chance to heal Gem Castle by 1. Anti-Fly 1 Flying enemies armor decreased by 10 and movement speed decreased by 150. || 900 ||30 || 340 (0.50s)
 * Grey Jade || || Overlook Increase attack range of allies by 300. Poison 5 Enemies take 16 damage per second. Lasts 5 seconds. || 800 || 30 || 340 (0.50s)
 * Monkey King Jade || || Poison 5 Enemies take 16 damage per second. Lasts 5 seconds. Overlook Increase attack range of allies by 300. Monkey King Bar Grants towers around with attacks regardless of evasion. || 1000 || 50 || 340 (0.50s)
 * Dark Emerald || || Stun Attacks have a 10% chance to stun the enemy. || 700 || 80 || 340 (0.50s)
 * Emerald Golem || || Stun Attacks have a 10% chance to stun the enemy. Corrupt 1 Decrease enemy's armor by 20. Stone Gaze 1% probability in attack to trigger Gaze: Enemies movement speed in 1000 range will be sharply decreased, even those faced to the Golem over 2s will be transformed into stone, rooted for 3s with 100% extra physical damage. || 700 || 150 || 340 (0.50s)
 * Yellow Saphire || || Ice Decrease nearby enemies movement by 75%. || 600 || 20 || 170 (1.00s)
 * Gold || || Corrupt 1 Decrease enemy's armor by 20. || 600 || 60 || 213 (0.80s)
 * Egypt Gold || || Corrupt 2 Decrease enemy's armor by 30. Greedy Attacks have a 1% chance to heal give you 1-50 gold. || 700 || 120 || 213 (0.80s)
 * Pink Diamond || || Crit 1 10% chance to deal x5 damage. Damage Attacks deal more damage. || 600 || 80 || 170 (1.00s)
 * Huge Pink Diamond || || Cleve 3 Deals 50% pure damage around 400 range of the target. Crit 1 10% chance to deal x5 damage. Damage Attacks deal more damage. || 700 || 220 || 213 (0.80s)
 * Bloodstone || || Lightning Chain Attacks have a 20% chance to spark a damaging lightning that jumps across enemies. || 700 || 35 || 170 (1.00s)
 * Antique Bloodstone || || Forked Lightning Attacks have a 50% chance to spark a forked lightning Burn 2 Deals 320 damage every second to nearby enemies. || 800 || 70 || 170 (1.00s)
 * Uranium-238 || || Radiation Attacks up to 10 enemy's at the same time. || 700 || 100 || 340 (0.50s)
 * Uranium-235 || || Radiation Attacks up to 10 enemy's at the same time. || 800 || 240 || 340 (0.50s)
 * Chrysoberyl Cat's Eye || || Aura 5 Increases allies attack speed by 60. Inspire Increase nearby gems attack by 50%. || 500 || 6 || 170 (1.00s)
 * Red Coral || || Aura 4 Increases allies attack speed by 50. Aura 5 Increases allies attack speed by 60. Inspire Increase nearby gems attack by 50%. Resist Towers nearby resist magic influence. || 500 || 80 || 269(0.60s)
 * Parabia Tourmaline || || Decadent Decrease nearby enemies armor by 15. || 600 || 30 || 283(0.60s)
 * Elaborately Carved Tourmarine || || Stun Attacks have a 10% chance to stun the enemy. Decadent 2 Decrease nearby enemies armor by 30.|| 700 || 100 || 283(0.60s)
 * Deepsea Pearl || || Resist Towers nearby resist magic influence. || 500 || 80 || 283(0.60s)
 * Yellow Saphire || || Ice Decrease nearby enemies movement by 75%. || 600 || 20 || 170 (1.00s)
 * Gold || || Corrupt 1 Decrease enemy's armor by 20. || 600 || 60 || 213 (0.80s)
 * Egypt Gold || || Corrupt 2 Decrease enemy's armor by 30. Greedy Attacks have a 1% chance to heal give you 1-50 gold. || 700 || 120 || 213 (0.80s)
 * Pink Diamond || || Crit 1 10% chance to deal x5 damage. Damage Attacks deal more damage. || 600 || 80 || 170 (1.00s)
 * Huge Pink Diamond || || Cleve 3 Deals 50% pure damage around 400 range of the target. Crit 1 10% chance to deal x5 damage. Damage Attacks deal more damage. || 700 || 220 || 213 (0.80s)
 * Bloodstone || || Lightning Chain Attacks have a 20% chance to spark a damaging lightning that jumps across enemies. || 700 || 35 || 170 (1.00s)
 * Antique Bloodstone || || Forked Lightning Attacks have a 50% chance to spark a forked lightning Burn 2 Deals 320 damage every second to nearby enemies. || 800 || 70 || 170 (1.00s)
 * Uranium-238 || || Radiation Attacks up to 10 enemy's at the same time. || 700 || 100 || 340 (0.50s)
 * Uranium-235 || || Radiation Attacks up to 10 enemy's at the same time. || 800 || 240 || 340 (0.50s)
 * Chrysoberyl Cat's Eye || || Aura 5 Increases allies attack speed by 60. Inspire Increase nearby gems attack by 50%. || 500 || 6 || 170 (1.00s)
 * Red Coral || || Aura 4 Increases allies attack speed by 50. Aura 5 Increases allies attack speed by 60. Inspire Increase nearby gems attack by 50%. Resist Towers nearby resist magic influence. || 500 || 80 || 269(0.60s)
 * Parabia Tourmaline || || Decadent Decrease nearby enemies armor by 15. || 600 || 30 || 283(0.60s)
 * Elaborately Carved Tourmarine || || Stun Attacks have a 10% chance to stun the enemy. Decadent 2 Decrease nearby enemies armor by 30.|| 700 || 100 || 283(0.60s)
 * Deepsea Pearl || || Resist Towers nearby resist magic influence. || 500 || 80 || 283(0.60s)
 * Uranium-238 || || Radiation Attacks up to 10 enemy's at the same time. || 700 || 100 || 340 (0.50s)
 * Uranium-235 || || Radiation Attacks up to 10 enemy's at the same time. || 800 || 240 || 340 (0.50s)
 * Chrysoberyl Cat's Eye || || Aura 5 Increases allies attack speed by 60. Inspire Increase nearby gems attack by 50%. || 500 || 6 || 170 (1.00s)
 * Red Coral || || Aura 4 Increases allies attack speed by 50. Aura 5 Increases allies attack speed by 60. Inspire Increase nearby gems attack by 50%. Resist Towers nearby resist magic influence. || 500 || 80 || 269(0.60s)
 * Parabia Tourmaline || || Decadent Decrease nearby enemies armor by 15. || 600 || 30 || 283(0.60s)
 * Elaborately Carved Tourmarine || || Stun Attacks have a 10% chance to stun the enemy. Decadent 2 Decrease nearby enemies armor by 30.|| 700 || 100 || 283(0.60s)
 * Deepsea Pearl || || Resist Towers nearby resist magic influence. || 500 || 80 || 283(0.60s)
 * Red Coral || || Aura 4 Increases allies attack speed by 50. Aura 5 Increases allies attack speed by 60. Inspire Increase nearby gems attack by 50%. Resist Towers nearby resist magic influence. || 500 || 80 || 269(0.60s)
 * Parabia Tourmaline || || Decadent Decrease nearby enemies armor by 15. || 600 || 30 || 283(0.60s)
 * Elaborately Carved Tourmarine || || Stun Attacks have a 10% chance to stun the enemy. Decadent 2 Decrease nearby enemies armor by 30.|| 700 || 100 || 283(0.60s)
 * Deepsea Pearl || || Resist Towers nearby resist magic influence. || 500 || 80 || 283(0.60s)
 * Elaborately Carved Tourmarine || || Stun Attacks have a 10% chance to stun the enemy. Decadent 2 Decrease nearby enemies armor by 30.|| 700 || 100 || 283(0.60s)
 * Deepsea Pearl || || Resist Towers nearby resist magic influence. || 500 || 80 || 283(0.60s)
 * Deepsea Pearl || || Resist Towers nearby resist magic influence. || 500 || 80 || 283(0.60s)

Secret Towers
Otomad Increases allies attack speed by 500. Melancholy
 * Agate
 * Split 2 Attacks up to 5 enemy's at the same time.
 * 3000
 * 430
 * 425(0.40s)
 * Ehome
 * Aura Max Increases allies attack speed by 70.
 * Ehome
 * Aura Max Increases allies attack speed by 70.
 * Aura Max Increases allies attack speed by 70.
 * Aura Max Increases allies attack speed by 70.
 * 500
 * 6
 * 163(1.00s)
 * Obsidian
 * Cleave 5 Deals 70% pure damage around 500 range of the target. Slow 5 Decreases enemy's movement speed by 180.
 * 600
 * 820
 * Fantastic Miss Shrimp
 * Lightning Chain Attacks have a 20% chance to spark lightning that jumps across enemies. Forked Lightning Attacks have a 50% chance to spark a forked lightning
 * Fantastic Miss Shrimp
 * Lightning Chain Attacks have a 20% chance to spark lightning that jumps across enemies. Forked Lightning Attacks have a 50% chance to spark a forked lightning
 * Fantastic Miss Shrimp
 * Lightning Chain Attacks have a 20% chance to spark lightning that jumps across enemies. Forked Lightning Attacks have a 50% chance to spark a forked lightning
 * Lightning Chain Attacks have a 20% chance to spark lightning that jumps across enemies. Forked Lightning Attacks have a 50% chance to spark a forked lightning

Stops attacking when melancholic
 * 1000
 * 1225
 * The Burning Stone
 * Burn 3 Deals 1600 magic damage every second to nearby enemies
 * 600
 * 0
 * Wings Stone
 * Burned
 * 0
 * Wings Stone
 * Burned
 * Wings Stone
 * Burned
 * Burned

Deals 100% magic damage in a 200 AoE with each attack
 * 600
 * random on tower build between 1-1024
 * }
 * }
 * }

Skills
Skills can be bought in GemTD using shells and they are then attached to the character you are currently using. Each skill has 4 levels which is upgraded by purchasing the skill again in the store. Shells are obtained at the end of the month depending on your global rank or you can purchase additional shells using the link provided in-game.

Waves
These are Waves 1-50 to "beat" the Game. After wave 50 the waves repeat themselves with different skills within a round.

Bosses all 10 waves.

In some waves there is a chance to find an alternative opponent.

Quests
Random Quests: Fixed Quests:

Strategies

 * Manage MVP bonuses properly to maximize damage in the late game.
 * Have a balance between physical and magical damage
 * Stack different levels of Opal auras for the attack speed and Sapphires for the slow. Having the same aura level such as two Opal E2 auras means that they do not stack and the two auras will only count as one.