A Super Mario Bros. X Thing: Prelude to the Stupid was the first major game developed by the Talkhaus through the Super Mario Bros. X engine, and is the second game in the A Super Mario Thing series. It follows Demo and Iris collecting leeks through "The Castle of No Significance". In addition to Demo and Iris, three other characters are playable; Kood (from Drama Mistery), Raocow, and Sheath (from ATXS).
Sir Fred is a platform game where the protagonist must infiltrate the great castle of Beni-Gómez to rescue his beloved princess. The player guides Sir Fred through different rooms of the castle to complete his mission. The protagonist must avoid the numerous dangers and use different objects that will help him reach his destination.