: Leave exactly one opening to your base. Right before the lead alien reaches the exit, sell a tower at the start and block the exit. The AI will turn around and walk all the way back. The Sell-and-Rebuild Economy
Focusing upgrades on towers positioned at the corners of your maze, as these get the most "uptime" attacking the enemies as they loop. Sonic/Freeze Towers: xeno tactic cheat
: Eliminating the fastest units first prevents your towers from wasting damage on slow targets. Essential Tower Combinations Tower Type Best Used For Strategic Synergy Gatling Weak, fast swarms Place at corners for maximum coverage. Plasma Heavy armor and bosses Pair with slowing towers to melt targets. Sonic Grouped enemies (AOE) Place at choke points where enemies bunch up. SAM Launcher Flying units only Keep in the center to cover the whole map. Step-by-Step Victory Blueprint : Leave exactly one opening to your base
For the modern Android version or PC emulations, you may find external "trainers" (software that runs alongside the game) that offer: Plasma Heavy armor and bosses Pair with slowing
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