| PC/MS-Windows pack. |  Cities of the World Jigsaw Puzzles Model 2369100 | 2023 | Steam Valve Corp. |
| PC/MS-Windows pack. | Cities Restored Model 2075260 | 2023 | Steam Valve Corp. |
| PC/MS-Windows pack. | Cities Virtual Reality Model 1956260 | 2023 | Steam Valve Corp. |
| PC/MS-Windows pack. | Citizens - Far Lands - Prologue Model 2182110 | 2023 | Steam Valve Corp. |
| PC/MS-Windows pack. | Citizens - On Mars - Prologue Model 2422390 | 2023 | Steam Valve Corp. |
| PC/MS-Windows pack. | Citizens - On Mars Model 2310630 | 2023 | Steam Valve Corp. |
| PC/MS-Windows pack. | City Legends - The Ghost of Misty Hill Collector's Edition Model 2432030 | 2023 | Steam Valve Corp. |
| PC/MS-Windows pack. | City Z Model 2245750 | 2023 | Steam Valve Corp. |
| PC/MS-Windows pack. | Clarent Saga - Chronicles Model 1848330 | 2023 | Steam Valve Corp. |
| PC/MS-Windows pack. | Claris The Princess Knight - Extra Story Model 2252180 | 2023 | Steam Valve Corp. |
| PC/MS-Windows pack. | Clash - Artifacts of Chaos Model 1430680 | 2023 | Steam Valve Corp. |
| PC/MS-Windows pack. | Clash - Robot Detective - Complete Edition Model 2222480 | 2023 | Steam Valve Corp. |
| PC/MS-Windows pack. | Class of '09 - The Re-Up Model 2318310 | 2023 | Steam Valve Corp. |
| PC/MS-Windows pack. | Clear Mosaic Model 2417790 | 2023 | Steam Valve Corp. |
| PC/MS-Windows pack. | Click & Cum Model 2298610 18 | 2023 | Steam Valve Corp. |
| PC/MS-Windows pack. | Clientele - Sexy Deckbuilder Model 2104270 | 2023 | Steam Valve Corp. |
| PC/MS-Windows pack. | Cockroach Simulator - House of Survive Model 2268800 | 2023 | Steam Valve Corp. |
| PC/MS-Windows pack. | Code - Pandora Model 1850520 | 2023 | Steam Valve Corp. |
| PC/MS-Windows pack. | Coffee Talk Episode 2 - Hibiscus & Butterfly Model 1663220 | 2023 | Steam Valve Corp. |
| PC/MS-Windows pack. | Coin Trader Simulator Model 2097410 | 2023 | Steam Valve Corp. |
| PC/MS-Windows pack. | Colored Effects Model 1892570 | 2023 | Steam Valve Corp. |
| PC/MS-Windows pack. | Coloring Game - Studio Model 2231040 | 2023 | Steam Valve Corp. |
| PC/MS-Windows pack. | Colossal Cave Model 2215540 | 2023 | Steam Valve Corp. |
| PC/MS-Windows pack. | Comic Book Company Manager Model 1612950 | 2023 | Steam Valve Corp. |
| PC/MS-Windows pack. | Company of Heroes 3 Model 1677280 | 2023 | Steam Valve Corp. |
| PC/MS-Windows pack. | Comrades and Barons - Gates of Freedom Model 1646380 | 2023 | Steam Valve Corp. |
| PC/MS-Windows pack. | Confabulation - Homestead Model 2355350 | 2023 | Steam Valve Corp. |
| PC/MS-Windows pack. | Conflux - Prologue Model 2346110 | 2023 | Steam Valve Corp. |
| PC/MS-Windows pack. | Conflux Model 2179610 | 2023 | Steam Valve Corp. |
| PC/MS-Windows pack. | Conflux Model 2301880 | 2023 | Steam Valve Corp. |
| PC/MS-Windows pack. | Connected Hearts - The Musketeers Saga Collector's Edition Model 2295530 | 2023 | Steam Valve Corp. |
| PC/MS-Windows pack. | Conquest Emperor Model 1934930 | 2023 | Steam Valve Corp. |
| PC/MS-Windows pack. | Console Simulator Model 1486910 | 2023 | Steam Valve Corp. |
| PC/MS-Windows pack. | Construction Manager Model 1896000 | 2023 | Steam Valve Corp. |
| PC/MS-Windows pack. | Controller Sync Model 2075820 | 2023 | Steam Valve Corp. |
| PC/MS-Windows pack. | Controller Model 2257680 | 2023 | Steam Valve Corp. |
| PC/MS-Windows pack. | Core-Blast Model 1721550 | 2023 | Steam Valve Corp. |
| PC/MS-Windows pack. | Cornucopia Model 1681600 | 2023 | Steam Valve Corp. |
| PC/MS-Windows pack. | Corponation - The Prologue Model 2410980 | 2023 | Steam Valve Corp. |
| PC/MS-Windows pack. | Corsair's Madness Prologue - Jungle's Island Model 2190570 | 2023 | Steam Valve Corp. |
