OCEAN · CURIO CARD 16 / 48
Coral reef
An underwater structure built by coral animals that shelters marine life. This source-backed topic becomes an original Spiral swarm challenge.
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Play Coral reef
Enemies sweep along expanding rotating paths with angled shots. Follow the space opening between the arms instead of camping in a corner.
Signature: Reef Cover. Branching paths cover the middle while parts of the reef shield. Keep to an open edge. This is fictional battle design, not a claim about the real subject.
Source: Wikidata Q11292 · English Wikipedia topic. Summary: Edited summary fact-check. Wikidata structured data is CC0; no article prose or photographs are copied here.
Default challenge: v2 rules, seed 219786. A shared link can carry another valid seed. Automatic weapon upgrades do not count as assistance; deliberately claiming the Super Weapon counts one and guarantees a clear.
How this card plays
Enemies sweep along expanding rotating paths with angled shots. Follow the space opening between the arms instead of camping in a corner. The first warning introduces Reef Cover. Later volleys alternate between that signature and the formation pattern. Survive three waves to earn a clean clear, or take one free assisted clear.