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Free Gamma Case opening simulator: $5.38 open cost, $4.10 EV, -23.73% Unbox ROI, 67 drops across 4 rarities. Test odds, history and win rate without spending keys. Updated June 3, 2026. Research and entertainment only.
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Gamma Case
Simulate Gamma Case opens at $5.38 ($2.89 case + $2.49 key) without spending real money. Compare runs to $4.10 EV and -23.73% Unbox ROI from the Details tab.
The Gamma Case simulator rolls 67 outcomes across 4 rarities at $5.38 per open, tracking session win rate against $4.10 EV.
Sessions deviate from $4.10 EV and 6.07% profit chance — that variance is the point. Lucky sims do not prove $5.38 opens are +EV.
Hold Gamma Case at $2.89 with 0.00% Investing ROI on Details; simulate opens at -23.73% Unbox ROI here — different intents.
CSProfit models Gamma Case at $4.10 EV — faster than real opens, not a profit promise.
It rolls 67 Gamma Case drops using the same weights as Details, values each hit at current prices and charges $5.38 per simulated open against $4.10 EV.
★ Bayonet | Gamma Doppler is 0.01% (about 1 in 19231). ★ Karambit | Gamma Doppler, ★ M9 Bayonet | Gamma Doppler, ★ Bayonet | Gamma Doppler lead average value; common tiers dominate the 67-item pool across 4 rarities.
Yes — virtual opens use the $5.38 modeled cost ($2.89 + $2.49) without charging your Steam wallet.
Detail EV is $4.10 (-$1.28 vs $5.38 open). Individual sims often land below that because commons dominate 6.07% profit chance.
It uses CSProfit's 67-item probability table for Gamma Case (updated June 3, 2026). It models randomness but is not Valve's server-side roll.
Modeled exp. profit is -$1.28 on $5.38 opens with -23.73% Unbox ROI. Most single opens still return items worth less than cost.
Click Open Once ($5.38 modeled) or Quick Sim for bulk runs. Compare history to $4.10 EV and 6.07% win benchmark.
You can hit ★ Karambit | Gamma Doppler ($8,525.83 avg.) in sim, but 0.01% rare drops remain unlikely. Session wins ≠ -23.73% long-run ROI.
Run 50+ Quick Sims, chart rarity distribution and compare win rate to 6.07% and EV to $4.10 — one lucky streak is noise.
The web tool is free. Real Gamma Case opens still cost $5.38 (USD) on Steam if you choose to open for real.