Objective: Survive 19 waves
You’ll only need Rocket towers for this level, that’s it.
Start by placing your first Rocket tower near the base in the gap in the pink blobs. If you are quick; you’ll be able to destroy 3 blobs before the first wave hits you. Do it, you’ll need the resources.
By wave 4 you’ll be able to build another rocket tower in the upper right. Use this tower also to destroy the blobs.
Build another rocket tower near your base.
Build another one above the big blob and target the blob.
Build another rocket tower in the upper left. Use any remaining resources to upgrade your towers. Start with the nearest to where the enemies enter the map.
Keep upgrading in a clockwise pattern.
Upgrade, upgrade…. and….. upgrade.
With any free resources you have at the end, you might want to build a couple more rocket towers.