Campaign checkpoints: Steam achievements explicitly reference Levels 1.1, 2.1, 3.1, 4.1, 5.1, 6.1 and 6.2. That list proves those levels exist; it does not prove that they are the complete campaign list.
Choose the level you need
| Level | Search intent | Guide |
|---|---|---|
| 1.1 | First clear / One Is Enough | The early one-tower route stays inside the achievement guide. |
| 2.1 | No-tower clear | Use active abilities only for Fine, I'll Do It Myself; no separate page is needed for this short objective. |
| 3.1 | Specialist / one tower type | Compare Flamethrower, Tesla and Gunner approaches. |
| 4.1 | Elemental Carnage | Use Flamethrower, Tesla Coil and Cryo Beam. |
| 5.1 | Triple Threat / three tower types | Choose between two community three-type builds. |
| 6.1 | Late-game clear / Four-tified | Build around the four funnels, then apply the no-ability restriction. |
| 6.2 | Final referenced checkpoint | Use Laser gates, lane damage and rear cleanup. |
The level and the achievement are not always the same job
A normal clear lets you use the whole unlocked toolbox. The associated achievement may remove abilities or cap tower variety. Decide which run you are attempting before placing anything; an unrestricted emergency click can save Level 5.1 and still invalidate Triple Threat.
| Achievement | Official condition | Guide |
|---|---|---|
| Specialist | Survive 3.1 with one tower type and no abilities. | Level 3.1 Specialist |
| Elemental Carnage | Survive 4.1 using only Flamethrower, Tesla Coil and Cryo Beam. | Elemental Carnage |
| Triple Threat | Survive 5.1 with three tower types and no abilities. | Level 5.1 Triple Threat |
| Four-tified | Survive 6.1 with four tower types and no abilities. | Four-tified |
| Against All Odds | Survive 6.2. | Level 6.2 |
Why a level guide stops matching your run
These are persistent-upgrade strategies, not fixed puzzle solutions. The same placement can fail when the relevant tower branch is behind the guide author's upgrade tree. Before moving every tower, identify what crossed the line.
- The whole lane arrives intact: the main damage or control layer is under-upgraded.
- Only scattered orcs escape: rear coverage is engaging too early or does not overlap the exit.
- Laser lines look right but miss: the wall angle is not producing the repeated crossings shown by the reference.
- Explosions make the leak worse: knockback may be pushing enemies beyond the next firing arc.
- The achievement does not unlock: re-check tower-type count and whether an active ability was used.
What these walkthroughs cover
Level numbers and achievement conditions come from Steam's official achievement catalogue. Placements and upgrade advice come from the release-build community guides linked below. Upgrade progress can change whether the same layout succeeds.
No complete Level 5.2 route yet
Players are asking for a 5.2 solution, but the two strongest current release guides both omit it. This index leaves the route open until a complete strategy with enough detail becomes available.