[🎃] Build a Reactor
- Playing now
- 114
- ▼ 21.5% 24h average vs the day before
- 24h average
- 161
- 24h peak
- 250
- 7-day peak
- 1,467
Player count history
Concurrent playersBuild a Reactor has 114 players online in the latest RoVitals sample. The highest count RoVitals has recorded since tracking began on Oct 9, 2026 is 1,693, on Oct 10, 2026. Over the last 7 days it averaged 454 players. It has 837.3K lifetime visits and 24.6K likes.
Performance analysis
Measured on average concurrent players rather than a single spike, Build a Reactor is down 21.5% day over day, down 26.7% week over week. Its last-24h average (161) is 64.5% below its 7-day average (454).
Build a Reactor set its observed peak 12 days ago; its 7-day average is 27% of that peak.
Over the last 13 days, Build a Reactor was usually busiest in the hour from 16:00 UTC, averaging 2.3× its quietest hour. Across the last 13 whole UTC days it averaged 49% more players on Saturdays and Sundays than on weekdays.
Player counts by period
| Period | Average | Peak | Change |
|---|---|---|---|
| Last 24 hours | 161 | 250 | ▼ 21.5% |
| Last 7 days | 454 | 1,467 | ▼ 26.7% |
| Last 30 days | 513 | 1,693 | — |
| Since Oct 9, 2026 | — | 1,693 | 15 days tracked |
Growth
| Metric | 24h | 7d | 30d |
|---|---|---|---|
| Visits gained | +12.7K | +228.6K | +513.4K |
| Favorites gained | +541 | +17,439 | +44,994 |
| Likes gained | +138 | — | |
| Dislikes gained | +3 | — | |
Visits, likes & favorites
Cumulative Roblox counters. Visits count game entries, not unique players.
- Total visits
- 837,356
- Favorites
- 78,900
- Likes
- 24,65898.1% positive
- Dislikes
- 465
Rankings
| Live players | #4,760 · Top 25% |
|---|---|
| 24h peak | #4,724 · Top 25% |
| Observed peak | #3,710 · Top 25% |
| Total visits | #15,099 · Top 50% |
| Favorites | #7,403 · Top 25% |
| Rating | #257 · Top 5% |
| In Simulation | #1,849 of 9,991 |
Records
| Observed peak | 1,693Oct 10, 2026 |
|---|---|
| Best day for visits | +56.5KOct 10, 2026 |
| 24h low | 86 |
| Avg. session (est.) | 18 min |
| Tracked since | Oct 9, 2026 |
| Days with recorded data | 15 days of history |
Daily breakdown
| Day (UTC) | Avg players | Peak players | Visits gained |
|---|---|---|---|
| Oct 22, 2026 | 165 | 250 | +13.6K |
| Oct 21, 2026 | 223 | 340 | +17.9K |
| Oct 20, 2026 | 407 | 632 | +30.8K |
| Oct 19, 2026 | 478 | 684 | +35.7K |
| Oct 18, 2026 | 625 | 1,467 | +48.4K |
| Oct 17, 2026 | 576 | 772 | +42.4K |
| Oct 16, 2026 | 662 | 1,185 | +49K |
| Oct 15, 2026 | 600 | 929 | +44.1K |
| Oct 14, 2026 | 584 | 916 | +42.4K |
| Oct 13, 2026 | 526 | 801 | +38K |
| Oct 12, 2026 | 521 | 806 | +38.3K |
| Oct 11, 2026 | 765 | 1,068 | +53.4K |
| Oct 10, 2026 | 784 | 1,693 | +56.5K |
Earnings model & assumptions
Roblox does not publish this game's earnings. These scenarios use an assumed monetization rate.
- Illustrative daily range
- $9.8 – $88
- 30 days at unchanged activity and assumptions
- $290 – $2,600
Modeled from average concurrent players, assumed earned Robux per player-hour by genre, and a fixed $0.0038 per earned Robux. These are not reported game earnings. The range is the central model divided and multiplied by three, not a confidence interval; actual earnings may fall outside it. Special DevEx rates, purchases, revenue shares and expenses are not modeled. Not financial data. Model assumption for this game: 2 earned Robux per player-hour. Formula and limitations.
Visits history
Compare Build a Reactor
Side-by-side player counts, peaks and growth against games of a similar size.
vs Claw Fishing
vs ANALOG [HORROR]
vs Average Day In America
vs [QUADS!] Project MXCompare any two gamesFrequently asked questions
How many people are playing Build a Reactor right now?
Build a Reactor's latest recorded count is 114 concurrent players on Roblox, sampled at 2026-10-23 07:39 UTC. That is 29% below its average over the last 24 hours.
What is Build a Reactor's highest recorded player count?
RoVitals began tracking Build a Reactor on October 9, 2026; its observed peak, the highest count sampled since then, is 1,693 on October 10, 2026; earlier peaks and peaks between samples may be higher.
How many visits does Build a Reactor have?
Build a Reactor has been played 837,356 times in total, 513,384 of them since RoVitals began tracking it on October 9, 2026.
How many likes does Build a Reactor have?
Build a Reactor has 24,658 likes and 465 dislikes on Roblox, 98.1% positive among recorded votes. It has 78,900 favorites. These are game totals, separate from its concurrent player count.
How much money does Build a Reactor make?
Roblox does not publish Build a Reactor's earnings. The RoVitals illustrative model gives roughly $9.8–$88 per day using average concurrent players and an assumed genre earnings rate. This is a model scenario, not reported revenue or a confidence interval; actual earnings can fall outside the range.
Description from Roblox, by Infinite Assembly
👋 Welcome to Build a Reactor! HALLOWEEN UPDATE! 🎃 How to Play: 🎲 Roll for powerful drills ⛏️ Place drills to mine ores ☢️ Evolve your Reactor with ores and generate energy 💵 Wait for the best price to sell energy ⬆️ Buy upgrades to boost your progress ✨ Discover rarer reactors, drills, and ores! 💻 Use code "RELEASE901" for a reward! 👍 Like the game and join the group for updates 🎮 Supports Desktop, Console, Mobile, and Tablet players
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Scroll the table to explore more metrics →
History since Oct 9, 2026. Data methodology.