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All maps and fast forward
Press Down(2), Up(2), Right, Left, Right, Left, Circle, X at the credits screen. The "charge" sound effect will confirm correct code entry.
999 health and 9,999 money
Press Up, Right, Down, Left, Up, Right, Down, Left, Circle, X at the credits screen. The "cha-ching" sound will confirm correct code entry.
Successfully complete Kingdom of Carrone Campain 1 to 3 to be able to customize your heraldry color and symbol.
Crossroads Extended/Endless mode
Successfully complete Crossroads in Classic mode.
Drylands Extended/Endless mode
Successfully complete Drylands in Classic mode.
Grasslands Extended/Endless mode
Successfully complete Grasslands in Classic mode.
Easy "Crystal Caves Gold" and "Crystalrunner" achievements
Build the maze to direct the runners down or your towers will alternate between the rail carts and ground enemies. Deal with all ground runners by the time the rail carts arrive so your Shotguns can focus on them.
Easy "Grasslands Gold" achievement
Set most of your upgraded towers on the direct path between the enemy spawn point and the exit to catch the flying enemies. Get the first Tesla Tower up by wave 20 for the helicopters. The ground enemies will only approach from one direction and can easily be kept occupied.
Easy "Guerrilla Warfare" achievement
Pause game play on any map and purchase a $5 minigun turret. Resume the game, then immediately pause again and sell the turret for $3. You will know if it did not register if the selling price will still be $5. Repeat the process twenty times to get a total loss of $40.
Easy "Precious Snowflake" achievement
You will increment your progress with each enemy every time they are slowed. You can get at least 2,000 slows per game with the proper setup. Leave space on a forgiving map to create a slow field early in your maze, where the fieldrunners will be out of reach of anything other than slowing guns. When done properly you can get at least 10,000 units per game. Consider doing this on "Frostbite", extended and the easy difficulty setting.
Easy "THIS IS SPARTA!" achievement
Your wins do not have to be in a single long streak. Your progress at overall perfect wins will be counted the course of the game.