Level 4-5
Mainframe Assault
Launch a direct assault on the city's Mainframe, the brain of Cyber City. This intense level features the "Upload Attack" - a unique mechanic where you must upload a virus while under heavy fire.
Level Objectives
- Upload virus to mainframe (100% progress)
- Defend upload nodes from enemies
- Maintain node integrity above 50%
- Complete upload within 4 minutes
Video Walkthrough
Step-by-Step Guide
Upload Mechanic Explained
Unlike normal levels, you're stationary at an upload node. The virus uploads automatically at 1% per second (100 seconds total). Enemies spawn continuously and attack the node. If node HP drops to 0%, mission fails. You must balance attacking enemies and protecting the node.
Node Defense Strategy
The node has 10,000 HP. Enemies deal: Basic (100 damage), Elite (300 damage), Kamikaze (1,000 damage). Priority: Kamikaze (glowing red) > Elite > Basic. Let basic enemies through if it means stopping a kamikaze - they do 10x damage.
Three Upload Phases
Phase 1 (0-33%): Light resistance, learn patterns. Phase 2 (34-66%): Elite enemies join. Phase 3 (67-100%): Kamikaze drones spawn. Each phase increases spawn rate by 50%. Save bombs for Phase 3.
Emergency Repair System
Every 25% upload progress, a repair drone spawns. Escort it to the node (shoots enemies blocking its path). Successful escort = node heals 2,000 HP. This is crucial for reaching 100% with node integrity above 50%.
Enemy Guide
Attack Drone
(Basic Assault)Tips: Standard enemies. Deal 100 damage per hit to node. They're numerous but weak. Group them together and use spread weapons.
Elite Hacker
(Heavy Unit)Tips: Tanky (5 hits) and deal 300 damage. They prioritize the node over fighting you. Take them out quickly before they reach the node.
Kamikaze Drone
(Suicide Attacker)Tips: Glows red, moves fast, explodes on contact with node for 1,000 damage. These can end your run. Drop everything and focus fire when you see red.
Repair Drone
(Ally Unit)Tips: Friendly unit that repairs the node. Protect it at all costs. If a repair drone dies, you miss 2,000 HP of healing - potentially run-ending.
Boss Battle Tips
- •Node positioning: Stay slightly behind the node (bottom-center). This lets you see enemies approaching from all angles
- •Phase 1 is a free heal phase: Focus on perfect defense, take no node damage. This builds your HP buffer for harder phases
- •Kamikaze drone tells: They spawn with a distinct sound cue (high-pitched beep). Train your ears to hear it over the chaos
- •Repair drone priority: When a repair drone spawns, create a clear path by destroying enemies in its route. Don't let them swarm it
- •The 4-minute timer is tight. You need approximately 75% upload speed (maintain good node HP) to finish on time