Puzzle Parasite

Puzzle Parasite strands the player on a strange planet built entirely around logic and reaction, where charging, moving, and connecting coloured energy cores activates mechanisms that reshape the environment: bridges power up, doors unlock, and buried ruins reveal themselves. Developed and published by the small studio Wrenfall, it's a first-person physics puzzler playable solo through a story campaign or with a friend through a separate, story-free co-op campaign. It released as a full, non-Early-Access title on 3 December 2025 for Windows, priced at US$14.99, with a free demo available whose progress carries over into the full game.

Portal, but you're swinging a cricket bat

The single most repeated comparison across the review pool is to Portal, and reviewers reach for it with real affection rather than as a knock. One writes, "I feel like this is an instant recommend for fans of Portal, and really anyone who enjoys logic puzzles. Or whacking things with a bat." Another simply calls it "Portal 2 puzzle meets Thomas Was Alone vibe." The core mechanic, striking spherical cores with a handheld cricket bat to send them curving toward targets, draws specific, repeated praise for how it feels in the hand: one reviewer describes "the perfect kind of game to sit back with... I love shooting and pulling the balls around. It's really satisfying to fire a perfect curve and get the ball to land exactly where you want."

Reviewers consistently describe the puzzle design as clever without being punishing, calling the overall tone "cozy" more often than "challenging." One writes that the game "started out easy, but some levels took me quite a while to figure out," while another says "every level gets just the right amount of extra difficulty." A minority disagree and find it consistently too easy, one reviewer who blazed through the campaign in just over two hours writes "I don't think any of the levels really caused me to have to stop and really think about it," and notes they may have "cheesed" some puzzles using physics interactions the designers may not have fully intended.

A co-op campaign built to stand on its own

Rather than folding co-op into the same story levels, Wrenfall built a dedicated set of co-op-only puzzles that intentionally skip the single-player narrative, a decision reviewers repeatedly single out as the right call. "The co-op part doesn't contain any of the story which is the right decision," one writes, "you won't spoil anything. It's a different experience." Several reviewers describe genuinely joyful sessions with friends, one simply writes "we had a BLAST," while another says they "laughed so hard I literally had tears streaming down my face." The co-op puzzles lean more on communication and timing than the solo campaign, and one reviewer notes it works even without voice chat, though they wouldn't recommend attempting it that way.

Where reviewers push back is on how much content that co-op campaign actually adds. One pair of reviewers reports beating the entire game, solo and co-op combined, in 105 minutes, writing "$15 for 105 minutes of playtime" as a direct complaint about value, especially for players who bought it specifically for the co-op's 25 dedicated puzzles. Steam's achievement data broadly supports a short overall runtime: the achievement for dying once sits at 89.6% of players, consistent with a low-friction, low-punishment design, while achievements tied to finishing specific optional challenges, avoiding certain cores or skipping certain aids entirely, sit in the single digits, suggesting most players complete the core content and don't return for deeper optional variety.

A story told lightly, and a demo that remembers you

The single-player campaign carries a light narrative thread alongside its puzzles, and reviewers are more mixed on this than on the mechanics themselves. Several call the writing and voice acting a genuine highlight, one reviewer flatly calls it "legendary voice acting," while others find the story serviceable rather than memorable, with one summarising it as "8/10" overall but noting "story is a bit meh in my opinion." What reviewers agree on is that the narrative never gets in the way, puzzles remain the clear focus, and the story simply gives each new area a reason to exist rather than demanding attention of its own.

One notable voice in the review pool comes from the game's own composer, who disclosed writing the score after already falling in love with the single-player campaign as a player, and who specifically calls out returning to the game post-completion just to hunt achievements or find more efficient puzzle solutions. That's echoed by several other reviewers who mention replaying old levels to look for faster or cleverer solutions even after finishing the main path, a small but genuine source of replay value beyond the base campaign length.

Wrenfall also built the game to let a free demo's progress carry directly into the full release, letting undecided players test the core mechanic before paying $14.99, a detail more than one reviewer specifically credits when explaining why they eventually bought in. Not every review is glowing on execution, one non-English reviewer notes the asking price felt steep against the amount of content and suggests the developer's marketing, UI, and Steam page presentation could use more polish going forward, sympathetic feedback aimed at a small studio rather than a dismissal of the game itself.

Final verdict

Puzzle Parasite earns its Portal comparisons honestly: a satisfying core mechanic, clever but approachable puzzle design, and genuinely funny voice acting carry a short but well-crafted single-player campaign, and its separate co-op campaign gives friends a real reason to play together rather than just tacking multiplayer onto the same content. The catch is almost entirely about length against price, several reviewers finish everything the game offers in well under three hours combined. Worth playing, ideally once the free demo has you hooked or once it's discounted.