Because the game was originally built in Flash, most cheats come in the form of "hacked" versions or memory editing tools:
Even with extra gold, many players fail Mission 6 due to Wave 100 flyers. Use these "legit" cheats—strategic exploits—to win: xeno tactic cheat new
You can use Cheat Engine on many browser versions to search for your current money value (4-byte), spend some gold, and scan for the new value to manually set your cash to 999,999. Because the game was originally built in Flash,