Arc Aquarium

Arc Aquarium is a card-collection game where you open packs and place collectible fish, shrimp, seahorses, plants and corals in aquariums. Cards come to life in the tanks, and you can fill four aquariums while completing a collection book with 143 species and over 120 plants and corals.

Collect and merge cards

There are seven packs: Freshwater, Reef, Plant, Coral, Gift, Rare Deck and Legend Deck. Cards have four rarities, from Common to Legendary, and each pack shows its odds. You can get three free Gift Packs every four hours, as well as daily rewards, quests and achievements. Packs cost gold earned in the game; there are no microtransactions.

Merge two identical cards to raise their star level. Above ★5, duplicates instead become merge points for your best card, up to ★10. Higher star levels mean bigger fish and more valuable cards.

Living aquariums

Placed cards swim, crawl or drift around the tank. Neon tetras sweep by in schools, seahorses curl their tails around plants, jellyfish pulse through the water, and shrimp pick at the sand. Each species moves in its own way.

You can upgrade each tank to hold up to 100 fish and 100 plants and corals. Customize them with 14 illustrated themes, including Japan, Egypt, Atlantis, Paris, the Netherlands and Istanbul, along with 19 sand colors. Drag, resize and layer plants and corals, then choose day or night mode and from 10 aquarium lamp colors.

Care and collections

Feed your fish and wipe algae from the glass, or use an automatic feeder when you are busy. Nothing gets sick or dies, and you can leave the aquarium running beside your work. The collection book offers rewards, alongside daily and weekly quests and 26 Steam achievements.