This guide I recommend for those players who have Heavy CLEO sniper and pyro minefield The number of drops after each wave is: Wave 1 - 0 Wave 2 - 4 Wave 3 - 4 Wave 4 - 5 Wave 5 - 6 Wave 6 - 6 Total: 25 Useful tips for achieving victory in solo 1. Try to save your CLEO ammunition at least until Juggernaut's first appearance. 2. Save explosives for the 5th and 6th waves 3. If a Juggernaut appeared try to kill him as soon as possible. 4. Use explosives to clear up poisoned space from bloater's gas as it not only clear your view but increase an explosion effect. 5. Set up pyro mines near to the technician to protect him from ferals as they can jump over the wall. 6. Drop each a wall repair kit next to every sector at the beginning.