UFO 50

UFO 50 is fifty fictional cartridge games from a fictional 1980s console, all built by Mossmouth (the Spelunky team plus collaborators) over nine years. The portable case writes itself: each cartridge is short enough that a commute fits one. The catch is that almost every cartridge is genuinely good, so the 50-hour figure on the box becomes 200 hours surprisingly fast.

Game overview

The conceit is that LX Systems was a small 1980s console maker that put out 50 cartridges over its lifetime, and somebody dumped the whole library. The framing device is a shelf in your house. You boot the system, pick a cartridge, play it, and put it back. Some are five-minute arcade games. Some are eight-hour RPGs (Avianos is the headline example: a turn-based strategy game with about 40 hours of campaign content). Some are spiritual ancestors of later Mossmouth work; Bushido Ball is a tennis-fighting game that arguably influenced Spelunky’s pacing.

Every cartridge has its own developer credit, its own save slot, and its own in-game manual. There are unlocks across the shelf for completionists, and a series of secrets that link the games together for the curious. The fiction is committed to all the way down.

Where you can play it

UFO 50 launched on Steam (Windows) on 18 September 2024. There is no GOG, Epic, or Microsoft Store version. The Switch port launched digitally on 7 August 2025 via Nintendo’s Indie World presentation, with a Fangamer physical edition (standard £35, deluxe £59) following on 20 February 2026. The Switch version received patch v1.7.8.30 in September 2025 that added pixel-perfect scaling, a button-swap option, and an empty-profile crash fix.

There is no PS5, PS4, or Xbox release as of June 2026. Push Square has reported that Mossmouth is “skipping PS5 for now” and the Switch port appears to be a timed console exclusive, but no other console dates have been announced. There is no mobile version.

On Steam Deck the game is Verified (Mossmouth confirmed on X in February 2026) and runs effortlessly on every cartridge. Battery draw is negligible across the lineup; the heaviest titles use vector graphics and barely move the needle.

Cross-saves and keeping your progress

No cross-save between Steam and Switch. Steam Cloud syncs PC to Steam Deck inside a single Steam account, but Switch saves stay on Switch. Each cartridge has its own save slot on each platform.

For UFO 50 this matters less than for most games, because the unit of progress is “the cartridge I am currently playing.” You are not 80 hours into a single save; you are five hours into Avianos, three hours into Bushido Ball, and one finished Mortol playthrough. Starting fresh on a new platform means re-unlocking some shelf-level secrets, but the inside-the-cartridge progress is the actual thing, and that you can rebuild quickly.

The pairings that work:

• Steam (PC) + Steam Deck for one continuous shelf across desk and handheld.
• Switch only for portable-first play with the post-patch pixel-perfect scaling, which makes the lower-resolution cartridges much easier to read on the Switch screen.

Owners of both platforms tend to settle on one as the “main” library and use the other for single-cartridge dipping.

Features that matter on the move

• Fifty cartridges, every session length. A five-minute commute fits a Mortol run. A two-hour flight fits a serious Avianos campaign session. The shelf is the killer feature.
• Suspend-resume is reliable on every cartridge. Each save slot is independent. Switch sleep and Steam Deck suspend both work cleanly.
• Pixel-perfect scaling on Switch (post-September 2025 patch). Makes the lower-resolution cartridges crisp on the handheld screen. Worth checking the option in the settings.
• Local couch co-op on many cartridges. Bring a second controller. Bushido Ball and Mortol II are the obvious party picks.
• Controller-first throughout. No touch needed. 8BitDo Pro 2 works on Switch and Steam Deck without re-pairing.

Recommended setup

For Steam library owners, the PC version on Steam Deck plus a Steam Cloud-synced desktop is the cleanest setup. The 16:10 Steam Deck screen is generous for the higher-resolution cartridges and the OLED makes the vector-styled games look better than they did in 1984.

For Switch-only owners, the digital version with the September 2025 pixel-perfect-scaling patch is the right buy. The Fangamer physical is for collectors specifically; the digital version is the same game and updates automatically.

The single recommended add is a second controller for couch co-op cartridges. The 8BitDo Pro 2 is the best travel-bag second pad because it pairs with Switch, Steam Deck, and PC without re-pairing rituals.

See the controllers guide for the wider multi-device picks and the cross-saves cornerstone for the platform-by-platform save story.

Verdict

The single most generous portable purchase you can make in 2026. Twenty pounds buys fifty short-to-medium games that almost all justify their slot on the shelf, all designed for sit-down-and-stand-up sessions. Pick the platform you already carry: Steam Deck for the bigger screen and Steam Cloud sync, Switch for the post-patch pixel-perfect handheld experience.