You can’t really have a list of cheap games without mentioning 3rd-party modifications, widely known as “mods” for short. A game not considered cheap might suddenly become a value proposition when combined with a strong mod community. Mods themselves are cheap, but they require the original game on which they’re built. In this case, you’ll need Portal.

Portal: Prelude is a full, lengthy campaign, set before the events in Portal. It was developed mostly by a small team of three living in Europe. It came as quite a surprise when it was announced shortly before its release, something very unusual in the mod community. The intent was to create a much more challenging Portal experience while retaining the atmosphere. This differs from other map packs in that those focus purely on the puzzles.
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