In Q4 1999 (Oct 1 – Dec 31, 1999), 1 game released on Steam. The most anticipated is Half-Life: Opposing Force (). Compared with the same window a year earlier (1 releases), it is the same size. Data as of .
| Releases scheduled | 1 |
|---|---|
| With a playable demo | 0 |
| Same window a year earlier | 1 (0 %) |
| Data as of |
| Game | Release | Followers |
|---|---|---|
| Half-Life: Opposing Force | 1999-11-01 | — |
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