What is Era Ball?
Era Ball is a free, browser-based basketball roster-building and season-simulation game. You draft a complete nine-player roster — a starting five plus a four-player bench — hire a head coach, and choose one of eight basketball eras spanning the 1950s through the 2020s. From there, the simulation engine plays out a full regular season and, if your roster qualifies, a playoff run, using a deterministic, seeded simulation model rather than a simple stat-add calculator.
This is a basketball legends draft game in the sense that every player-season card has its own archetype, strengths, and weaknesses, but it isn't tied to any real league, team, or player likeness — every card in the current dataset is an original fictional archetype built specifically for this game.
It's an original, independently built game — not a clone of any other roster-drafting game, and not affiliated with any of them.
How to play
Start a new run from the welcome screen, or use Quick Draft to auto-generate a full roster instantly if you just want to see the season simulator in action. A standard run follows ten steps: choose an era, draft your five starters one slot at a time, draft your four bench players, pick a head coach, review your team's ratings and chemistry, simulate the regular season (instantly or one game at a time), simulate the playoffs if you qualify, and review your final results. Every draft round offers three candidate players for the open slot — pick the one that best fits your plan, or spend one of your limited rerolls if none of the three fit.
Why the selected era matters
Each of the eight eras — 1950s, 1960s, 1970s, 1980s, 1990s, 2000s, 2010s, 2020s — applies its own pace, scoring, three-point value, interior-scoring value, defense, rebounding, and playmaking modifiers to every player on your roster. A stretch-shooting big who thrives in the spacing-heavy 2020s will rate very differently once those same three-point ratings get discounted under a 1950s or 1960s ruleset that barely rewards the three-point shot at all. This is the core of the basketball decade simulator idea behind the game: the same nine players can field a championship contender in one era and a below-.500 team in another, purely because of how that era's style of play values (or doesn't value) their skill set.
How roster chemistry works
Beyond raw ratings, Era Ball scores team chemistry from how your roster actually fits together: shooting and floor spacing, ball-handler and secondary-creator availability, frontcourt rebounding, positional versatility, bench depth, coach-system fit, and how well your players' own eras match the simulation era you picked. A well-built roster earns visible chemistry bonuses like Elite Spacing, Twin Playmakers, or Perfect Coach Fit; an unbalanced one takes penalties like Usage Conflict, Thin Bench, or Poor Era Fit. Every bonus and penalty shows the specific reason it triggered, so you can see exactly what to fix on your next all-time basketball lineup builder attempt.
How the season simulation works
The simulation engine is seeded and deterministic — the same seed and the same roster always produce the same result, and every run's seed is visible and shareable. You can also enter someone else's seed from the welcome screen to play through their exact same sequence of draft options yourself. Regular-season games factor in starter quality, bench depth, minutes distribution, player stamina and durability, positional fit, home-court advantage, schedule difficulty, game-to-game variance, in-season fatigue, and short-term (never permanent) fatigue dips. Choose fast simulation to see the whole season instantly, or game-by-game to reveal results one contest at a time — both respect your device's reduced-motion setting. If your win total is strong enough, you'll clinch a playoff seed and move into an era-appropriate bracket, tracked game by game with a series MVP and key matchup for every round.
Tips for building a championship roster
- Match your roster's skill set to your chosen era's modifiers — a three-point-heavy build is far stronger in the 2010s or 2020s than in the 1950s or 1960s.
- Draft at least two players who can create their own shot; relying on a single ball-handler triggers the No Secondary Creator chemistry penalty.
- Don't stack multiple high-usage scorers in your starting five — Usage Conflict can quietly cap your offense rating.
- Pick a coach whose preferred archetypes actually match your roster; Perfect Coach Fit is one of the largest available chemistry bonuses.
- Use your rerolls on bench slots you're unsure about — starters usually matter more than a marginal bench upgrade.
Frequently asked questions
Is Era Ball affiliated with the NBA?
No. Era Ball is an independent, unofficial basketball simulation game. It is not affiliated with, endorsed by, or licensed by the National Basketball Association or any professional basketball team, and it is not affiliated with any other game that uses a similar name or premise.
Do I need to create an account to play?
No. Era Ball runs entirely in your browser and saves your progress, achievements, and run history to local storage on your device. No account or personal information is required.
What does the era I choose actually change?
Every era applies its own pace, scoring, three-point value, interior-scoring value, defense, rebounding, and playmaking modifiers to your roster's ratings. A roster built for fast, high-scoring 1980s basketball won't automatically dominate a slower, defense-first 1990s simulation.
Can I replay the same roster with a different outcome?
Each run has a shareable seed, and you can enter someone else’s seed from the welcome screen to play through the exact same sequence of draft options they had. If you both make the same picks, you get the same result — if you don’t, you get a real head-to-head comparison on identical starting conditions.
How many players do I draft?
A full starting five (point guard, shooting guard, small forward, power forward, and center), a four-player bench, and one head coach — ten selections in total.
Are the players in Era Ball real historical players?
No. Every player-season card in this first version is an original, fictional archetype. This keeps the dataset free of any real-player likeness or sourcing issues while the game proves itself out.
Unofficial-project disclaimer
Era Ball is an independent, unofficial basketball simulation game. It is not affiliated with, endorsed by, or licensed by the National Basketball Association or any professional basketball team. Historical names and statistics, where used, are presented for informational and entertainment purposes.