Slotbound Campaign Stages: All Six Battlefields in Order
The six Slotbound campaign stages in order, what each battlefield adds, which clears unlock the Hard achievements, and where a normal run should stop pushing.
Slotbound has six campaign battlefields: Open Forest, Deep Cave, Wasteland, Lost Ruins, Crimson Hell and Split Space. Each one adds a pressure the last did not, and each has a Hard-clear achievement, which is the cleanest way to measure how far the community has pushed.
The stage names are not printed on the store page front and centre. They come from the achievement list, where Master of the Open Forest, Master of the Deep Cave, Master of the Wasteland, Master of the Lost Ruins, Master of the Crimson Hell and Master of Split Space each ask for a Hard clear. Add Total Conquest and Into the Abyss, and the shape of the campaign becomes visible.
The six battlefields
| Order | Battlefield | Hard clear rate | What it adds |
|---|---|---|---|
| 1 | Open Forest | 41.4% | The baseline: open ground, simple lanes |
| 2 | Deep Cave | 21.7% | Tight space, split armies, opened to Normal in 0.4.0 |
| 3 | Wasteland | 9.3% | Ranged pressure, the Bloodtail boss |
| 4 | Lost Ruins | Not published | Denser waves, later-run builds |
| 5 | Crimson Hell | Not published | Maximum pressure before the finale |
| 6 | Split Space | Not published | The final test |
The clear rates are the useful column. They are not difficulty ratings, they are population counts, and they tell you where the player base thins out: 41 percent of players clear the first battlefield on Hard, 9 percent clear the third, and the last three are rare enough that Steam does not publish a rate on the public page.
What each stage asks of you
Open Forest
The tutorial battlefield. Wide ground, gentle waves, enough room to learn that absorbing is the only real growth. If you are losing here on Normal, the problem is the absorb order, not the stage.
Deep Cave
Closed space changes the fight more than any stat. A cave splits your army, which means a single clump of units cannot cover both approaches. This is the stage that teaches two-front placement, and it was opened to Normal difficulty in 0.4.0 after being a harder-mode option during early access.
Wasteland
The desert battlefield introduces ranged enemies and the boss Bloodtail, whose health bar runs across the top of the screen. Ranged pressure is the first real check on a melee-only army: if your carry has no reach, the Wasteland is where it dies.
Lost Ruins, Crimson Hell, Split Space
The last three battlefields are where the campaign becomes a build test. They combine the earlier ideas: split approaches, ranged pressure, and waves that arrive with enough enemies that a single carry cannot clean up alone. The achievement names suggest escalation rather than new mechanics.
A practical expectation: a build that clears the Wasteland on Normal will not automatically clear Lost Ruins. The jump from stage 3 to stage 4 is where a mixed army with no synergy starts to fail.
Unlock order and progression
Stages unlock by clearing, and the difficulty setting is separate from the stage. That separation is important because it means you can push a new battlefield on an easier difficulty to learn it, then return on Hard for the achievement.
Two rules of thumb:
- Clear on Normal before pushing Hard. The Hard achievements are per-battlefield, so there is no reason to grind a stage you have not learned.
- Do not skip ahead for loot. There is no meta-progression that makes a later stage easier; the tree and cores reset every run, so a stage you cannot beat is a stage you cannot beat.
Which stage should you play?
| Your situation | Play |
|---|---|
| First ten runs | Open Forest on Normal |
| Clearing Open Forest reliably | Deep Cave on Normal |
| Learning two-front placement | Deep Cave, any difficulty |
| Chasing the Wasteland clear | Wasteland on Normal until the boss dies once |
| Hunting Hard achievements | The highest stage you can clear on Normal, on Hard |
The general rule is to push difficulty before pushing stages. A Hard clear on an earlier battlefield teaches more than a Normal clear on a later one, because the later stages assume the habits the earlier ones teach.
The launch patch changed the curve
The 1.0 hotfix series reduced the overall difficulty and made the first two stages easier. If you played the demo or early access, your memory of the curve is stale: the Open Forest and Deep Cave are gentler than they were, and the global tuning is softer.
That is good news for new players and mildly bad news for veterans, because the early stages now under-teach. If you are clearing Open Forest without losing a life, move up rather than farming it.
Achievements tied to the campaign
The battlefield achievements are the campaign's completion markers, and they are covered in the achievements guide→. The related clears, Total Conquest and Into the Abyss, reward finishing the campaign structure rather than a single battlefield.
If you are chasing the last three Master achievements, the Hard mode guide→ is the next read, because the difference between a Normal clear and a Hard clear on the same stage is mostly preparation discipline.
Sources
Official source: Slotbound on Steam ↗
- Steam store page ↗ for the campaign and wave structure.
- Steam achievement stats ↗ for the six Master achievements and their clear rates.
- Steam news hub ↗ for the 0.4.0 Deep Cave change and the launch hotfix difficulty pass.
FAQ
How many stages does Slotbound have?
Six campaign battlefields: Open Forest, Deep Cave, Wasteland, Lost Ruins, Crimson Hell and Split Space, each with its own Hard-clear achievement.
Do stages unlock in order?
Yes. You clear a battlefield to move on, and difficulty is a separate setting rather than a stage gate.
Which stage is the hardest?
Split Space is the final battlefield. The public achievement rates stop being published after the Wasteland, which suggests the last three are rare clears.
Can I replay a stage?
Yes. Replaying is how you chase Hard clears and campaign achievements.