Blue Illusion (Expert) is the second stage in Growing Blue.
The stage starts off deploying 3 Kroxos and 2 Shibaliens. After a while, Kroxos are deployed in a 10 second interval, and 3 LeMurrs spawn with a timer that ranges from 1500f to 3000f.
After the base is hit, Elizabeth the LVIth, Ursamajor, and more Kroxos are spawned. A second Ursamajor appears 30 seconds after the first one.
Due to the strength of these aliens, it is recommended to first achieve at least all of Chapter 1's crystal treasure before attempting this stage.
Strategy 1 (ft. Castaway Cat)
Lineup: 3 Meatshields, Strong Anti-Alien Tankers, Castaway/Seafarer, Long range backup or wave immune units.
Stall the Kroxos and Shibaliens while leveling up your wallet. If they start to push, use an attacker to defeat them, let it die, and continue stalling. Once you get enough money and wallet level, start stacking Castaways. The more you stack, the easier it will be to get rid of Elizabeth.
Once you hit the base, deploy all you have against the enemies, while keeping your money in mind. When Elizabeth is defeated, use ranged units to get rid of the Ursamajors.