https://www.pcgamer.com/smart-puzzler-qube-is-free-for-the-next-24-hours/

If you're feeling stuck for games to play today, then here's a suggestion: try Q.U.B.E, the puzzler from 2012 about manipulating coloured blocks with sci-fi gloves. It's free for the next 24 hours or so, it'll only take you three hours to complete, and it's a smart game with lots of good ideas. Click here to grab it.

Don't expect flashy visuals—its environments are mainly sparse, sterile white rooms punctuated by the coloured blocks, and it definitely lacks a bit of personality. Still, I think it's worth playing, and so did our review at the time, which argued that some of its puzzles were "almost as impressive" as Portal's. High praise indeed.