Skull Tweak in Bloons TD 6 becomes significantly more challenging on Standard (Hard), with faster bloons, stronger waves, and less room for mistakes. The map’s distinctive skull-shaped layout, water areas, bridges, and line-of-sight blockers make efficient tower placement essential for maintaining reliable coverage. By taking advantage of the map’s available land and water space, building a strong early defense, and investing in powerful upgrades, you can handle the increased pressure and successfully clear every round.