Head Rat is a boss in Purgatorio, the co-op action RPG on Roblox set in a fan-made version of the Project Moon universe. Boss encounters in the game are the checkpoints that let your office climb from one grade to the next, so knowing how they fit into a run matters as much as knowing how to fight them.
Quick answer: Head Rat is fought as part of a major request. Complete enough regular jobs to trigger the major request, defeat the boss, and your office promotes to a higher grade with new jobs and buffs unlocked.
How boss fights fit into a Purgatorio run
In Purgatorio you and up to three other players run an office in The City, taking on jobs to earn money and experience. Bosses are not random spawns you stumble into. They arrive through the major request system.
Doing enough standard requests eventually triggers a major request, which is usually the task of killing a difficult boss. Clearing that major request is what promotes your office, opening up harder jobs and passive buffs for the whole team. Head Rat sits inside this loop as one of those boss targets.
Office grades in the current demo
The build currently live is an early demo, and it only carries content from Grades 9 through 7, which cover the Canard through Urban Legend ranks. That range sets the boundary for which bosses and major requests you can reach right now.
| Element | Detail |
|---|---|
| Grade range in demo | 9 to 7 (Canard to Urban Legend) |
| Promotion trigger | Complete a major request, usually a boss kill |
| Reward for promotion | Harder jobs plus buffs for you and teammates |
| Data note | Only Sin Level carries over between demo sessions |
Note: because this is a demo, most progress does not transfer between sessions apart from your Sin Level, so treat a boss clear as progress within the current run rather than a permanent unlock.
Combat controls you need for a boss like Head Rat
Head Rat is a skill-based fight, so the defensive and offensive inputs carry the encounter. The core control layout applies to every boss in the game.
| Action | Input |
|---|---|
| Basic Attack | LMB |
| Dodge | Q |
| Evasive | B |
| Block | F |
| Abilities | Z, X, C, V |
| Auxiliary Abilities | 2 |
| Use Item | R |
| Switch Weapon | 1 |
Weapons, augments, auxiliary abilities, and skill tree points all feed into how much damage you can push and how well you survive. Augments give stat boosts and passives, while auxiliaries are flexible abilities that slot into any build.
Protect your progress before the fight
Dying or failing to be revived can cost you the auxiliary abilities and skill tree passives you earned during a run. Buying an insurance plan is what saves your character after death, which matters most heading into a demanding boss encounter.
Two other pressures run in the background. Modifiers raise the difficulty of a run in exchange for more Starlight currency, and blessings spend Starlight to make a run easier while halving your Starlight gain. Taxes are due at the end of every week, and failing to pay three times gets your character killed and resets the office, so keep enough income flowing before committing to a boss run.
How to confirm the boss counted
You know a boss like Head Rat mattered when the major request completes and your office promotes to the next grade. That promotion is the on-screen confirmation, and it comes with newly unlocked jobs and buffs for the team.
If the promotion does not happen, the usual reason is that the boss was tied to a major request you had not fully triggered yet. Major requests only appear after you have cleared enough standard jobs, so build up that job count first, then take on the fight.
Head Rat is one link in Purgatorio’s promotion chain, and the fight rewards preparation more than raw aggression. Line up your weapons, augments, and insurance, keep your taxes paid, and treat the boss as the gate between office grades rather than a detour.
