- Singularity Roller
- SINGULARITY WORLD
- Singularity: Tactics Arena
- SiNiSistar
- Sinister Halloween
- Sinister Halloween (ALL DLC)
- SINISTRY SILINIUM
- Sink Again
- Sinking Island
- SiNKR v1.0.44
- Sinless
- SINNER: Sacrifice for Redemption (Update 2)
- SINNERS
- Sins of a Solar Empire: Rebellion (v1.94 & ALL DLC)
- Sins of a Solar Empire: Trinity
- Sins Of The Demon RPG
- Sipho
- Siphonophore
- Sir Lovelot
- Sir War-A-Lot
- Sir You Are Being Hunted v1.4
- Sir! I’d Like To Report A Bug! v1.0.3
- Siralim 2 v2.4.0
- Siralim 3 v1.4.3
- Siralim Ultimate
- Siralim v2.3.0
- Sirius: Age of the Free Agents
- Sister Travel
- Sisterly Bliss ~Don’t Let Mom Find Out~
- Sisterly Lust
- Sisters in hotel
- Sisters In Hotel: Episode 2
- Sisters in Hotel: Episode 3
- Sisters of Silent Liberty
- Sisters Royale: Five Sisters Under Fire
- Sisters ~Natsu no Saigo no Hi~
- Sitting Ducks
- Six Ages: Ride Like the Wind v1.0.10.2
- SIX SHOTS
- Six Sides of the World v1.12
- Six-ear Macaque
- Sixth Grade Detective
- Sixtieth Kilometer
- Size Matters
- Size Matters
- Sizeable
- SizeBlock
- SJSM – Karamari Hospital
- SK8
- Skate City
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