How to use the guides
Start with the first-wall guide if you have not held a wave. Use the machine guide when coins are sitting in the shared wallet and you need to know which purchase covers the wider beach.
Which Stop The Tsunami! guides are published?
Build your first wall and start a round
Claim the daily rewards, raise one continuous packed sand wall, cut a trench, and only then press START ROUND.
Walls, trenches, and late-game materials
Cover the whole approach with a thick packed wall and a trench, then extend that line as each cleared stage widens the beach.
Spend coins on the next useful machine
Follow the published ladder from toy spade to dump truck, and spend the shared wallet on the job your current defense is failing.
Split dig, drive, and patch in co-op
Share one coin wallet and split the server into digger, driver, and mid-wave patcher before anyone presses START ROUND.
When to leave Easy for Medium or Hard
Easy, Medium, and Hard use the same defense actions. Move up when your wall holds a wider beach, not because the mode name sounds next.