Bloons Tower Defense 6 is a tower defense game about monkeys versus balloons. Colorful bloons float along a winding path, and every one that reaches the exit costs you lives. To stop them, you buy monkey towers and place them beside the track: dart monkeys throw darts, tack shooters spray in every direction, and bomb towers blow up whole groups at once. Each popped bloon gives you money, which you spend on new towers or on upgrades that make the ones you already have much stronger. Bloons have layers, so a pink one turns into a blue one, then green, then red when you pop it, and later rounds bring tougher types that need special towers. This version is a fan remake built in Scratch, so it has fewer maps and towers than the full game, but the strategy feels the same. If you want the classic flat version too, try Bloons Tower Defense 4.
Click a tower in the shop, then click a spot next to the track to place it; the cost is taken from your money. Click a placed tower to see its upgrades and buy the next level. Press the start button to send the next round. Place your first towers near curves in the path, since a tower at a bend can hit the bloons for longer. Try to spread your money between a few strong towers instead of filling the map with cheap ones. Watch what the next round will bring and prepare for it, because some bloons are immune to darts or hard to see without the right upgrades.