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• Vortex
• Semtex
• Blacksun
• Drifter
• Krypton
• HES2010

• Level 0
• Level 1
• Level 2
• Level 3
• Level 4
• Level 5
• Level 6
• Level 7
• Level 8
• Level 9
• Level 10
• Level 11
• Level 12
• Level 13
• Level 14

Level 4

Level 4 is a binary requiring some simple analysis / reverse engineering.

Hint: Keep in mind about resource limits