Choose Reiko's Fragments
Choose Reiko's Fragments if you want the Shared/Split Screen PvP side of the pairing. On Steam, it's currently about 50% cheaper on the Steam Store. Reiko's Fragments launched in 2019.
Reiko's Fragments vs Under Lock
Reiko's Fragments and Under Lock both land in Action, Indie, Early Access on Steam, which is why they keep getting compared. The comparison below is built from each game's Steam metadata — release year, genres, categories, Steam Deck status, price, and review score — refreshed daily by imho.run's scraper. Headline differences: Both share Action, Indie, Early Access on Steam. Reiko's Fragments (2019) is 2 years older than Under Lock (2021). Under Lock scores higher on Steam reviews (71.4% positive) than Reiko's Fragments (68.5% positive). No login or purchase needed — scroll for the full table, the verdict FAQ, and links to ranked similar games for both titles.
Which should you pick?
Choose Under Lock
Choose Under Lock if you want the Online PvP, Online Co-op, and LAN PvP side of the pairing. On Steam, it has co-op, so you can bring a friend. Under Lock launched in 2021.
Both Reiko's Fragments and Under Lock sit in Action, Indie, and Early Access on Steam and both list Multi-player, PvP, and Tracked Controller Support, so either pick lands in the same broad neighborhood. Use the side-by-side table for the feature view, or follow the "Games like" links below to see ranked alternatives for either title.
Side-by-side comparison
 Reiko's Fragments |  Under Lock | |
|---|---|---|
| Released | 2019 | 2021 |
| Genres | Action, Indie, Early Access | Action, Indie, Early Access |
| Platforms | Windows | Windows |
| Steam Deck | Unrated | Unrated |
| Price | 4.99 USD | 9.99 USD |
| Steam reviews | 68.5% positive (124 reviews) | 71.4% positive (35 reviews) |
| Multiplayer | Multi-player | Multi-player, Online Co-op, LAN Co-op |
| Developers | Pixel Canvas Inc | NioTum |
Side by side
- Both share Action, Indie, Early Access on Steam.
- Reiko's Fragments (2019) is 2 years older than Under Lock (2021).
- Under Lock scores higher on Steam reviews (71.4% positive) than Reiko's Fragments (68.5% positive).
- Reiko's Fragments is currently ~50% cheaper on Steam than Under Lock (4.99 USD vs. 9.99 USD).
- Under Lock has co-op; Reiko's Fragments does not.
Reiko's Fragments vs Under Lock — FAQ
- Should I play Reiko's Fragments or Under Lock first?
- If you want chronology, Reiko's Fragments (2019) came out before Under Lock (2021). If neither is a sequel to the other, order doesn't really matter — start with whichever fits your current mood, since both share enough on Steam to make either a reasonable opener.
- Are Reiko's Fragments and Under Lock similar?
- They overlap on Action, Indie, Early Access on Steam, so the catalogue groups them together — but "similar" depends on the specific mechanics. Use the genre + category rows above to decide whether the overlap matches what drew you to the one you've already played.