Legacy Frequency

Point and Click : 

4 "levels" 

Level 1: 
Click on enemies, avoid allies. Allies are shown as an echo that radiates from them. 

Level 2: 
Level 1+ new type of enemy that appears as an ally ship getting closer to you. 

Level 3: 
Level 2+ new type of enemy that goes towards allies. When going towards you, it is quicker. 

Level 4: 
Level 3+ new type of enemy, only found with the legacy frequency to the left