Hell Wave — oleada 90 of Endless mode — is the signature boss encounter in ST Blockade Battlefront. Dr. Toilet spawns with enormous HP, summons add waves, and enrages if the fight drags too long. Players who arrive at oleada 90 with incomplete Titan upgrades discover quickly that Hell Wave is a DPS check, not a mechanics puzzle you can outplay with clever positioning alone. Esta guía explains how to beat Hell Wave from pre-run preparation through the final Dr. Toilet kill, separate from our general how to play overview.
What Hell Wave Demands
Hell Wave combines everything Endless taught: lane management, Cen economy, skill timing, and maximum Titan DPS. By oleada 90 you should have completed the full wave buy order including Titan Drill Man and remaining upgrades from the waves 76–90 phase. Cen milestones near wave 70 target 28,000 cumulative earnings — if you are behind, farm oleadas 25–50 before attempting another 90 push. Hell Wave does not forgive missing TV Man upgrades or skipped Cineman purchases.
Preparation: Waves 70–89
Treat waves 70–89 as Hell Wave prep, not victory laps. Spend the waves 76–90 budget phase maxing every remaining Titan upgrade. Confirm chokepoint placement covers all lanes — Hell Wave adds spawn from multiple angles simultaneously. Refill tienda del helicóptero weapon ammo and upgrade tiers if Cen allows. Enter wave 88 with all character skills off cooldown. Study Endless mode documentation for post-90 scaling if you plan to continue after the boss dies.
Recommended Titan Layout for Wave 90
Stack upgraded Titans at the central intersection where maximum lanes overlap. Drill Man and TV Man provide AoE for add clears; Cameraman and Speakerman focus boss damage during vulnerability windows. Do not spread Titans to cover the map perimeter — Hell Wave adds punish wide formations. One emergency Titan near the base gate catches stray leaks. Reference the Titan tier list for current S-tier endgame picks if balance patches shifted rankings.
| Phase | Priority | Reason |
|---|---|---|
| Waves 70–75 | Buy Titan Drill Man | AoE for pre-boss elite waves |
| Waves 76–85 | Max all upgrades | DPS floor for Dr. Toilet |
| Wave 88–89 | Hold skills, repair positioning | Full toolkit for oleada 90 |
| Wave 90 | Kill adds first, boss second | Prevents base melt during enrage |
Dr. Toilet Boss Mechanics
Dr. Toilet enters with a standard attack pattern cycling between direct lane charges and ranged slam attacks. During charge phases, smaller toilet adds spawn from side lanes — kill these immediately because they deal disproportionate base damage compared to their HP. When Dr. Toilet's health bar hits phase thresholds, an enrage visual activates: movement speed increases and slam frequency doubles. This is when unprepared runs collapse. Save slow and stun skills for enrage entry, not the opening phase when Dr. Toilet is easiest to damage.
How to Beat Dr. Toilet: Step by Step
Step 1: Start oleada 90 with character positioned at central chokepoint. Step 2: Let Titans aggro adds while you apply character weapon DPS to Dr. Toilet during stationary phases. Step 3: When adds overwhelm a lane, switch character focus for three seconds to AoE clear, then return to boss. Step 4: Trigger stun/slow as enrage begins — watch for red aura and audio cue. Step 5: Burn all remaining skills in enrage phase while Titans maintain add control. Step 6: If base HP drops below 20%, abandon boss focus entirely and clear leaks — a living base with partial boss HP can sometimes recover; a dead base cannot.
How to Protect Your Base During Hell Wave
Base HP is the hidden timer on Dr. Toilet. Adds that leak during boss focus deal more damage than the boss itself over a long fight. Helicopter alerts still cycle during oleada 90 — use them to predict which side lane spawns adds next. Base defense fundamentals apply at maximum intensity: proactive positioning beats reactive chasing. If one lane consistently leaks, temporarily shift a Titan's effective range by adjusting your character's aggro pull — some weapons draw enemy attention briefly, buying Titans time.
After Hell Wave: Post-90 and Nightmare
Beating Hell Wave completes the standard 90-wave arc and unlocks badge progress toward the full 28-badge collection. Endless continues with post-90 scaling for players chasing leaderboard depth. Once Normal Hell Wave is consistent, attempt Nightmare mode oleada 90 for exclusive skins and bragging rights. Hell Wave clears also signal readiness for Boss Rush farming and the UTCM Assembly Quest — endgame systems that assume you can deploy a maxed Titan roster under pressure.
Troubleshooting Failed Hell Wave Attempts
Log why you failed: DPS timeout (boss still above 40% HP when base died), add leak cascade, or early enrage death from skipped skills. DPS failures need more upgrades — farm waves 50–70 until milestones match calculator targets. Add leaks need tighter chokepoints or earlier add-clear focus. Enrage deaths need skill discipline — practice holding cooldowns from wave 85 onward. Most players beat Hell Wave within three dedicated attempts once waves 70–89 are clean. Persistence with targeted fixes beats random rerolls.
Walkthrough en video
Click to load: How to Beat Hell Wave and Dr. Toilet