Single-player game, download and play.
Build a defense line, then click the "Ready" button to start the game.
Use gold to buy or upgrade defense towers to prevent the enemy from reaching the final point.
Gold is earned by destroying enemies.
Three levels of difficulty, corresponding to different scenarios.
Even if the level fails, the remaining coins will be kept.
If you want to challenge a higher difficult level, it's best to accumulate enough coins on the simple level.