Mission 23: Enigma!

On Day 1, move your sub east and dive. Use your lander to drop off an infantry and anti-air on the other shore. Use the infantry to capture the north-center base and the anti-air to attack Sturm's two fighters and bomber. Move a transport copter with a mech east, then drop it off the next turn to capture properties. Move all other units southward over the first two days.

On Day 2, use your lander to reveal Sturm's sub and your sub to destroy it. Clear all other naval units from Sturm, including a sub and battleship to the east, plus all landers Sturm builds.

By Day 5, capture the port or build an APC to fuel your underwater sub, or it will explode.

Consider building a cruiser to take out air units over the sea, and potentially another sub to take out sea units faster.

Capture the eastern port. Use your sub to eliminate naval units, allowing you to transport tanks from a lander to the eastern island.

Concentrate most forces on the southern base in the middle. Keep 1-2 anti-aircraft units following the road east to eliminate nearby air units.

Build a lot of tanks, as they have decent vision and can one-hit KO most of Sturm's units due to Max's direct unit advantage.