This level is only playable during clan wars on weekends. You have to be in a clan with at least 2 active people before the weekend starts. Or you can practice it any time if you are a supporter on Patreon

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The fire dragon has found our hidden castle in the mountains! It will blast one lane on day 10, 20, 30, and 40. Then on day 50 it will fly to the castle, so it must be shot down. This castle has the most space of any level in Tower Swap. It's a 6x7 grid of tiles, but no water. You can't toss anything off the side because it's built into a steep valley in the mountains.