"Upgrade your shield's reflection capability early. It's the most cost-effective way to deal with ranged flyers while you focus on the ground monsters." Technical Note

Pro Tip : Upgrade it so you can drop the portal at your current mining spot and warp back to the dome just seconds before a wave hits.

: Focus on your drill before speed. As you go deeper, the rock hardness increases significantly. If your drill is under-leveled, you will waste entire cycles trying to break a single block.

To get the most out of (Build 9900689), the most useful "feature" you can utilize is the Teleporter gadget . In this specific build of the game, managing your time between mining deep underground and returning to defend your dome is the primary challenge, and the Teleporter effectively doubles your efficiency. Top Features & Gadgets to Prioritize

: This UI feature tells you exactly when the next wave is coming. In Build 9900689, keeping a close eye on this allows you to stay in the mines until the very last second, maximizing your resource gathering.

: This is widely considered the best gadget in the game. It allows you to instantly transport resources or yourself back to the dome.

: If you find the Teleporter too resource-heavy to upgrade early on, the Lift is a great alternative. It automates the movement of resources to the surface, letting you focus entirely on digging. Community Tips for Build 9900689