Build a Boss Guide: The basic loop
About
OverviewBuild a Boss is a Roblox game where you assemble a boss out of guns, lasers, and armor, then send it into battle against waves of enemies. Winning fights earns you cash and gems to buy more parts and skills, letting you push through 75 levels spread across 10 zones. This guide walks you through building your boss, earning stars, farming currency, and tackling the competitive modes.
What is on this page
Contents
The basic loop
Step
Before your first fight, you need to put parts on your boss. After each victory you collect cash and gems, which you then spend on more parts or skills before heading back in.
- Visit the shop spend your starting cash on parts and attach them to your boss.
- Fill your slots place a part in every slot you have unlocked before entering a level.
- Fight the level send your boss against the enemies and clear the stage.
- Collect your rewards take the cash and gems the victory gives you.
- Upgrade or rebuild buy new parts, unlock more slots, or pick up a skill before the next level.
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Star ratings and what they require
TableEvery level grades your performance after you finish.
| 1 star | clear the level in any condition |
| 3 stars (Unscathed) | finish with full HP; using healing items is allowed |
| Red star (Nohit) | take zero damage the entire level; healing does not count as a hit |
Slots, parts, and skills
Check
Slots determine how many parts your boss can carry at once. More slots mean a stronger, more complex boss. Skills are purchased separately and add another layer of power on top of your parts.
- Unlock new slots so you can attach more parts at the same time.
- Fill every slot you own with parts to earn the Crowded badge.
- Work toward unlocking every slot in the game to earn the Land Owner badge.
- Buy skills from the shop alongside parts; purchasing every skill earns the Fully Wired badge.
- Place every part in the game on your boss at once to earn the Abomination badge.
Progressing through the 10 zones
TipsClearing certain zones unlocks badges such as Scrap King for the Scrapyard, Frost Warden for the Frostlands, and Hive Mother for the Hive.
- Check whether you have unspent cash or gems.
- Look for slots you have not unlocked yet.
Daily rewards and the AFK zone
Summary
The game offers several passive income systems alongside active play.
- Daily rewards log in and claim every day to earn the Daily Claimer badge
- 30-minute reward stay in the game without leaving to collect it twice and earn the Still Here badge
- AFK zone remain in this dedicated area for eight continuous hours to earn the Overnight Farm badge
Endless mode and OP speedrun
TipsEndless mode has a single global leaderboard, while OP speedrun ranks players per level.
- Getting your boss onto the global Endless leaderboard at any rank earns a badge; reaching the top 25, top 5, or number one earns progressively rarer ones.
- Placing anywhere in a level's OP speedrun leaderboard earns a badge; the same top-25, top-5, and first-place tiers apply here too.
Badge goals to aim for
TableThe table below lists every badge and what you need to do to earn it.
| Badge | How to earn it |
|---|---|
| Joined | Join the game |
| Crowded | Fill every slot you own with parts |
| Land Owner | Unlock every slot in the game |
| Abomination | Place every part in the game on your boss at once |
| Fully Wired | Buy every skill |
| The Whole Road | Clear every level with at least 1 star |
| Not a Scratch | Clear every level with at least 2 stars |
| Invincible | Clear every level with 3 stars |
| Untouchable | Clear every level with red stars (true no-hit) |
| Unscathed | Finish any level with full HP (healing counts) |
| Nohit | Finish any level without taking damage (healing does not count) |
| Daily Claimer | Claim every daily reward |
| Still Here | Collect the 30-minute reward twice without leaving |
| Overnight Farm | Stay in the AFK zone for 8 hours without leaving |
| Scrap King | Clear the Scrapyard |
| Frost Warden | Clear the Frostlands |
| Hive Mother | Clear the Hive |
| Endless: Top 50 | Reach the global Endless leaderboard at any rank |
| Endless: Top 25 | Reach top 25 on the global Endless leaderboard |
| Endless: Top 5 | Reach top 5 on the global Endless leaderboard |
| Endless: Top 1 | Reach number one on the global Endless leaderboard |
| OP Speedrun: Top 50 | Place on any level's OP speedrun leaderboard |
| OP Speedrun: Top 25 | Reach top 25 on any level's OP speedrun leaderboard |
| OP Speedrun: Top 5 | Reach top 5 on any level's OP speedrun leaderboard |
Community strategy ideas
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Build a Boss
Glossary
Glossary- Cash
- A currency earned from winning fights, used to buy parts and skills.
- Gems
- A second currency earned from winning fights, used to upgrade your boss.
- Slot
- A space on your boss where one part can be attached; unlocking more slots lets you field a larger build.
- Red star
- The top rating on a level, awarded only if you take zero damage throughout the entire run.
- Endless mode
- A separate mode with a global leaderboard where players compete against each other.
- OP speedrun
- A per-level leaderboard that ranks players on each stage.
- AFK zone
- A dedicated area where you continue earning rewards while away from your screen.
Common questions
FAQWhat is the difference between 3 stars and a red star?
Three stars means you finished the level with full HP — using healing items is fine. A red star means you never took any damage at all during the run; healing does not count as taking damage.
What are the Endless mode and OP speedrun badge cutoffs?
Both modes award badges at the top-50, top-25, top-5, and number-one cutoffs.
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