Yggdrasil’s Atlantean Gigarise takes place in the sunken city of Atlantis, featuring a visually stunning underwater world. The reel set is surrounded by schools of fish, creating a majestic atmosphere. The game emphasizes the expansion of reels, as fully expanded reels are crucial for triggering the streak bonus game. In the base game, there are three randomly assigned tiers, while the bonus round reveals the respective tiers through different color keys. Players can enjoy numerous free spins and have the opportunity to land five jackpots. However, the top value premium symbol only awards 2x for five-of-a-kind, so increased paylines are necessary for bigger regular wins. The golden column wild symbol substitutes for regular pay symbols, helping players form winning combinations. The trident symbol activates the Rising Reels feature, increasing the respective reel’s height by one row. This also increases the number of win ways, which is displayed below the reels at all times. When a trident symbol lands on a fully expanded row, the Streak Bonus Game is triggered. There are three versions of the bonus game, each with its own rewards. After the bonus game ends, the triggering reel is reset to three rows. During the bonus game, players are taken to a new reel set with a highlighted row. Starting with three lives, players accumulate cash prizes, jackpots, or free spins when coins land on the highlighted row. Five progressive jackpots are up for grabs, each with its own seed levels. The free spins are played out after the streak bonus game ends, and players can trigger the bonus round by landing three, four, or five scatters during the base game. This awards 20, 40, or 80 free spins, respectively. The expanded reels from the base game do not carry over into the bonus round. Retriggering the bonus round is possible by landing additional scatters. The underwater theme complements the leisurely pace of the game, and expanding the reels towards different tier streak bonus games adds a sense of purpose and progress. While the jackpots are not massive, they still add excitement to the bonus games. With an average RTP of 96%, players can chase the jackpots without paying too much. The game offers plenty of free spins and extra spins, allowing players to trigger multiple streak bonus games within each free spins round. The regular potential win of 4,370x is decent, but unlocking additional win ways is necessary due to the low symbol value. Some alternative slot games with similar themes and features include Pillars of Asgard, Oceanus Rising, and Riches of Atlantis.