Blue Prince creator Tonda Ros has nearly 700 hours in UFO 50 and calls it his favourite game in two decades

Tonda Ros, the developer behind Blue Prince, sat down with PC Gamer's Disk Cleanup series to talk through his Steam library — and the standout detail is his near-700-hour obsession with UFO 50, which he calls "easily my favourite game of the last 20 years."

Right now Ros is deep into Cairn, the rock-climbing adventure from The Game Bakers, and he's effusive about its control scheme — each limb controlled in sequence, no tutorial needed. He draws a sharp comparison to Baby Steps, noting that both games share the same conceptual DNA of controlling individual limbs across difficult terrain, but land in completely opposite places on the feel spectrum: Cairn is smooth and frictionless, Baby Steps is deliberately punishing. Before Cairn, he wrapped up Big Walk with a group of friends, praising it as the first social proximity chat game he'd ever played — one he'd been holding out for since its Game Awards announcement, deliberately skipping similar titles in the meantime.

Blue Prince launched in 2025 after roughly nine years of development, drawing on influences ranging from Myst to the puzzle book Maze: Solve the World's Most Challenging Puzzle and board game Jewels in the Attic. Ros came to game development from a background in cinematography and visual art, and the game's meticulous, nonlinear design reflects that long gestation. It landed as one of the most talked-about puzzle games of the year.

Ros says he's currently handling tech support for Blue Prince while experimenting with new ideas, and he's already thinking smaller for whatever comes next — "logistically," as he puts it. No title or timeline yet, but the direction is clear.