Claiming the first place is Portal, originally conceived as a technical demo by Valve. However, the game mechanics were so ingenious and required such a shift in thinking that it is still considered one of the best games ever.
The character has to escape from a large facility where all kinds of strange happenings occur – controlled by the emotionless machine GlaDOS. Equipped only with the “portal gun” – it can create 2 portals that connect the world at various points.
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How difficult it is for the human brain to truly come to terms with these possibilities can only be understood by having played the game itself. In any case, this is a worthy number 1 for the top 5 best Steam games under €10. Portal not only offers challenging puzzles but also an interesting story and top-notch humor. A short but very intense pleasure.