How to Survive HELL Difficulty in Coop TD: Together

To survive HELL difficulty and push past wave milestones like Level 95 in Coop TD: Together, you must replace single-target lane defenses with wide area-of-effect (AoE) kill zones and a strict gold economy. Place high-scaling area towers at map bottlenecks, slow dense enemy clusters, and maintain at least two high-level gold towers to fund your late-game upgrades.

Establish Early Area-of-Effect Kill Zones

Single-target units cannot handle the mob density on HELL difficulty. High enemy counts will quickly breach your front line if you rely on single-target burst damage. Focus your initial investments on multi-target units placed at high-value map locations.

• Placement: Build your primary AoE towers at the first curve or bottleneck along the path. This maximizes the time enemies remain inside your damage range.
• Upgrades: Prioritize tier upgrades on your area-damage units early. Higher-tier AoE towers deliver the consistent damage over time needed to chew through rapidly scaling health pools.

Maintain Gold Income for Mid-Game Scaling

Many HELL mode runs fail during the mid-game transition because high-tier tower upgrades become exponentially expensive. You must invest in your economy early to sustain continuous upgrades.

Keep at least two high-level gold-generating towers active throughout the run. Do not spend all your resources on immediate defense during quieter waves; invest early in economy multipliers so you have the gold necessary to upgrade your defensive grid when mob density spikes.

Maximize Tower Synergies and Skill Cooldowns

Enemy density increases significantly as you approach Level 95. To prevent fast or durable enemies from pushing through your defenses, pair high-damage towers with crowd control.

• Adjacent Slows: Place slowing towers directly next to your main AoE clusters. Keeping enemies inside damage zones longer acts as a direct multiplier to your total damage output.
• Ability Timing: Save your support skill cooldowns for major enemy surges. Spikes in wave density occur every ten waves; hold your abilities for these packed waves rather than spending them on routine spawns.
• Cluster Reinforcement: When mob health spikes, reinforce existing tower clusters instead of building weak single towers across the map. Concentrated damage is far more effective than spread-out defense.

Adapt Defenses and Accept Space Trade-Offs

If mobs begin leaking past your choke points, evaluate your line immediately:

1. Identify your lowest-performing unit.
2. Sell the low-impact tower to recover resources.
3. Replace it with a higher-tier tower that offers crowd control or armor-shredding utility.

Running gold-generating units consumes limited board space, which forces you to operate with a shorter overall defensive line than in Normal mode. Protecting your gold units during early waves is mandatory; losing early income prevents you from affording the late-game crowd control required to clear the board.