堆沙、挖護城河、倒沙桶蓋塔，看海浪湧進、沖垮你的沙堡。
小時候在海邊蓋沙堡，總會等著第一道浪打上來。《沙堡潮汐》把那個下午搬進瀏覽器裡：一片手繪感的熱帶海灘、清澈的淺水、會走來走去的螃蟹，還有一片真的會流動的海。
你可以堆沙、挖護城河、築城牆，把沙桶倒扣成一座座高塔，再插上小旗子、擺上貝殼。漲潮時，海水會順著你挖的溝渠灌進來；一道大浪捲過來，沒築好的城牆會被沖散，塔底的沙吸了水會慢慢坍塌。
免費就能玩白沙灣整片海灘、全部工具、守城挑戰第 1～2 關、收集圖鑑和拍照，作品可存 3 個；免費版含廣告。「完整版」一次買斷，再開放珊瑚島、河口、岩岸小灣 3 個場地與挑戰第 3～5 關，作品可存 12 個，並移除廣告。
海水用「淺水方程」計算：每一格記錄水深和流量，潮汐和湧浪從畫面邊緣推進來，所以浪會順著你挖的地形走。沙則是依「安息角」計算，太陡就往旁邊滑落，被水流帶走的沙會沉積在別處。畫面最後加上移軸模糊，看起來像一座縮小的模型海灘。
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Pile sand, dig moats, pour bucket towers — then watch the tide roll in and wash your castle away.
Everyone who built sandcastles as a kid remembers waiting for the first wave. Tidebuilt brings that afternoon to your browser: a hand-painted tropical beach, clear shallows, crabs scuttling about and a sea that really flows.
Pile sand, dig moats, raise walls and turn buckets into towers, then add little flags and shells. When the tide rises, water creeps along the channels you dug; when a big wave rolls in, weak walls wash away and soaked tower bases slowly slump.
White Sand Bay, every tool, challenges 1–2, the treasure collection and photo mode are free, with 3 save slots; the free version shows ads. The one-time Full Version adds Coral Atoll, River Delta and Rocky Cove, challenges 3–5 and 12 save slots, and removes ads.
The sea runs on shallow-water equations: each cell stores water depth and flow, and the tide and swell are pushed in from the edge, so waves follow the shape you dug. Sand uses an angle-of-repose rule — anything too steep slides sideways — and sand carried by water settles somewhere else. A final tilt-shift blur makes the beach look like a miniature model.
