All-time NBA lineup simulator
Can you go 82-0?
Draft an all-time NBA five. An engine fit to 1,170 real seasons simulates all 82 games — and finds every hole in your lineup.
Live engine output — the same model that grades your draft.
No account needed · free forever
Best draftable five ever found: 79–3 · nobody's gone 82–0 yet
Most all-time lineup builders just add up box-score averages. That gets it backwards.
Five 30%-usage stars, one basketball — on paper it never breaks down.
That's backwards.
Curry, Jordan, LeBron, Giannis, Jokić — and it still docks them −13.2 for usage overload.
The engine gets it right.
One basketball can't feed five ball-dominant stars. Our engine knows that. A box-score adder doesn't.
How to play
An orange TEAM reel and a violet ERA reel land on a franchise and decade. Lock one and re-spin the other to hunt the player you want.
Browse that era's roster and slot a player at each position — PG, SG, SF, PF, C. Eligibility is enforced: five point guards is not a lineup.
The engine simulates all 82 games and returns a record, a letter grade, and a plain-English breakdown of what helped and what hurt — and in Daily mode, ranks you on a server-verified leaderboard.
An engine that plays real basketball
SweepSzn is fit to 1,170 real NBA team-seasons — not hand-tuned. It tracks finite possessions, era-normalizes every player, gives defense equal weight with offense, and scores spacing and fit. The result punishes exactly the lineups a box-score adder adores — the difference between a 74-win team and a 40-win one.
See exactly how the engine works →Spin the reels. Draft your five. Go for 82-0.
No account needed. Runs in your browser. Daily mode resets every 24 hours.
More about the engine
SweepSzn is a browser-based all-time NBA lineup simulator where you draft a five-player starting five by spinning a franchise reel and a decade reel, then simulate a full 82-game NBA season. The simulation engine is calibrated to 1,170 real NBA team-seasons (1985–2025) across 24,687 player-seasons, with out-of-sample accuracy of about 5.6 wins RMSE against luck-adjusted Pythagorean win totals in year-grouped cross-validation (6.1 against raw win totals). Unlike lineup tools that simply add up box-score averages, SweepSzn models finite possessions and usage overload (too many ball-dominant stars costs wins), era normalization via per-season z-scores (so Wilt Chamberlain's pace-inflated 1962 numbers are not compared directly to modern stats), floor spacing, rim protection, and lineup fit and redundancy. Every result includes a plain-English “Why this record” breakdown — a two-column helping/hurting factor list and a per-player role label (Lead creator, Rim protector, 3&D wing, Floor spacer) — so you understand exactly what is working and what is costing wins. Daily mode gives every player the same spins each day and ranks results on a verified server-side leaderboard with streak tracking. Classic mode shows player statistics during the draft; HoopIQ mode hides them so you draft entirely from memory. Factor Hunt mode asks you to predict which engine factor matters most before the reveal; Prime Draft drops the era reel so you can build cross-era fives with every player at his peak; Blueprint mode has you commit to a tactical objective before the spin and grades your execution; and Surgeon mode diagnoses your lineup's worst factor and gives you one targeted swap to fix it. You can also challenge a friend to the same spins. Every result generates a unique shareable permalink and result card. The goal: can you build an all-time NBA five that goes 82-0, undefeated over a full season? Nobody has — the best draftable five projects 79-3, better than the 73-9 Warriors, and the engine is brutally honest about why.