Empire of the Undergrowth- 3.2 easy w/ challenge mode: Sol's Rush(strat in desc)
So this strat was made by Solstitium on Discord, one of the founders of ICS.
ICS discord: / discord
Here is the strat:
Select Front Line, setting the difficulty to easy with the challenge active. Move all workers into the nest group, send out the media to gather leaves from the area directly north of your nest. The additional workers will speed up early groundwork inside the nest – they’ll need to build a leaf storage chamber by the entrance of capacity 110 to 130, make space to add seven more tiles to the existing worker chamber near the nest entrance, and dig out a small area for refuse. The refuse chambers should have a capacity of 160 to 180. After these tasks are complete, send the fourteen workers outside to harvest with the media. Do not harvest on any plateaus.
Using your current nest workers, dig out the media chamber to open up into the main tunnel, then build more media until you get exactly 14 of them. From there, build a single (taunt) major. By this time the army ants aren’t long off arriving so the moment you build the major tile you need to be bringing your media outside the nest with gathering off. Put the major in a separate group to prevent it from turning back, then send your army to the bottom of the map by the first army ant spawn point. Optimally, you should arrive just after the first wave of army ant majors passes by. Avoid confronting them to save yourself from the flashbuff. After they have moved on, camp the spawnpoint and you should successfully beat the level in under or around seven minutes.