Zero-K (ZK; formerly known as Complete Annihilation and CA) is a free multi-platform open source real-time strategy computer game. Initially based on content from Total Annihilation on the open source Spring Engine, it was forked and all proprietary content replaced, and evolved into a completely new game with unique features. Among the games powered by the Spring game engine, Zero-K is particular…
Zero-K is a fantastic free-to-play RTS that offers a deep and engaging gameplay experience, reminiscent of classic games like Total Annihilation and Supreme Commander.
The game features a wide variety of units and strategies, allowing for unique gameplay experiences in both single-player and multiplayer modes.
The developers are actively involved in the community, providing regular updates and balancing changes, which enhances the overall experience.
The game suffers from a steep learning curve, which can be overwhelming for new players, especially with the vast number of units and mechanics.
The graphics and UI could use improvement, as they feel dated and may detract from the overall experience for some players.
The community can be toxic at times, with experienced players often being unwelcoming to newcomers, which can discourage new players from enjoying the game.
gameplay
348 mentions Positive Neutral Negative
38%
59%
3%
The gameplay of Zero-K is widely praised for its depth, variety, and innovative mechanics, drawing comparisons to classic RTS titles like Total Annihilation and Supreme Commander. Players appreciate the balance between micro and macro management, the intuitive controls, and the engaging campaign that gradually introduces complex strategies and unit types. While some criticize the graphics and occasional balance issues, the overall consensus is that the gameplay experience is rewarding, dynamic, and highly replayable, making it a standout in the RTS genre, especially considering it is free to play.
“The gameplay is enjoyable most of the time and is nostalgic with well-integrated modern concepts that help to keep this genre relevant to avoid that dated feel.”
“The gameplay is fast, fun, and easily accessible.”
“The diverse choice of strategies stemming from its wide choice of starting factory gives players a chance to explore a rich and deep gameplay, and due to lots of intuitive UI additions from your standard RTS, it feels like you have a lot of control over your units without the need for exhaustive clicking.”
“The mechanics of the game are quite sound, but it lacks variety in the abilities of the units and the enemy tactics. After half a dozen games, it becomes a bit monotonous repeating the same tactics over and over. In the end, I found myself completing missions in the most indirect and least efficient way in an effort to add some variety.”
“A lot of the game's mechanics feel like they're at odds with each other and stapled together, like turrets designed to be built on shorelines that happen to do bonus damage against underwater units, which you probably won't reasonably see until they are out of the water anyway.”
“Game has potential, but its balance is absolute garbage. The defensive turrets and other defensive options are way too powerful, forcing players into lame turtle-style gameplay.”
graphics
223 mentions Positive Neutral Negative
22%
63%
15%
The graphics of the game are generally described as dated and simplistic, often compared to retro styles reminiscent of early RTS titles. While many players acknowledge that the visuals lack modern polish, they often emphasize that the engaging gameplay compensates for these shortcomings, making the overall experience enjoyable despite the graphical limitations. Some users appreciate the nostalgic aesthetic, while others express a desire for improved graphics and UI design to enhance the game's appeal.
“The graphics are not mind-blowing, but I actually think the game is rather attractive and very visually clear. There's various outline toggles to play around with if you desire more clarity too.”
“Despite looking incredibly dated and that its graphics are on par with Roblox, this game is still incredibly fun and it's open source.”
“The graphics are good enough for the battles to be intense; however, not so complex that you need a super PC to play it.”
“The graphics are not what I'd call up to date, and the sound design could use a bit more polish. It also has a steep learning curve at first and could use a lot more players to make it lively.”
“The graphics and textures could be better, I must admit, but the gameplay completely makes up for it.”
“The graphics are a little dated, but it doesn't matter because the game itself is so much fun.”
story
168 mentions Positive Neutral Negative
14%
80%
6%
The game's story is minimal, primarily serving as a backdrop for its extensive campaign, which functions as a tutorial to introduce players to various units and mechanics. While there are over 70 missions that offer a variety of challenges and unlock new units, the narrative lacks depth and coherence, often feeling like a series of disconnected tasks rather than a cohesive storyline. Players appreciate the campaign's structure and gameplay mechanics but express a desire for a more engaging and developed story to enhance the overall experience.
“The campaign is a great introduction to all the different units and mechanics, though some of the later missions are quite hard, even on easy.”
“Each mission unlocks new units and structures, providing a gradual learning curve that keeps the gameplay engaging.”
“The campaign branches, gradually unlocking the various buildings and units, and if you find one mission too hard, you can just go around it.”
“The campaign is a bit lackluster story-wise, though the mechanics are good.”
“There is absolutely no story; it's played for fun and to experiment with your newly gained units after you beat one mission after another.”
“The campaign backstory (if any?) is just serviceable.”
music
54 mentions Positive Neutral Negative
37%
52%
11%
The music in the game receives mixed reviews, with many players finding it either uninteresting or poorly suited to the gameplay, often describing it as generic or reminiscent of stock tracks. Some appreciate the dynamic nature of the music, noting that it can enhance the intensity of battles, while others express a desire for more epic or custom soundtracks. Overall, while there are moments of enjoyment, the consensus leans towards the need for improvement in the musical selection to better align with the game's action and atmosphere.
“The music is pretty good, not gonna lie.”
“The music suddenly turns into an epic pace that pumps adrenaline into all over your body in 5 seconds.”
“It has a great soundtrack which won't get out of my head.”
“Only criticism I can really raise is the in-game musical choices, which are often rather soft, relaxed, and feel somewhat at odds with the gameplay itself.”
“And the music is horrible to listen to, and does not fit the game at all.”
“The music is all free tracks (which feel like - or probably are - tracks used in a million YouTube videos during the early 00's) and don't have a common musical theme.”
optimization
33 mentions Positive Neutral Negative
36%
55%
9%
Overall, the game's optimization is a mixed bag; while many players appreciate its good performance on mid-tier systems and the ability to handle large battles smoothly, others report significant performance drops in late-game scenarios, particularly on larger maps. Some users noted bugs and optimization issues, especially after recent patches, but many still find the game enjoyable and well-polished for a free title. The graphics may not be top-tier, but they are often deemed acceptable given the game's performance capabilities.
“So cool game plus it's free and well optimized.”
“Moreover, its unique use of physics, highly optimized performance (with very few exceptions), and ability to let the player sculpt the terrain are all exceptional.”
“I've been playing all kinds of RTSs since 1992 and I must say Zero-K is probably the most complete, optimized, and smartest RTS I've ever played.”
“This game will probably work on any mid-tier to low-tier computers/laptops, but you'll be suffering a lot if you play with a low-tier one considering this game's insane units limit and a tiny lack of optimization.”
“Optimization is close to zero in this game; after the latest patch, the performance took another hit.”
“Overall the game is fun, but me and friends get frustrated very easily late game with very poor performance.”
monetization
26 mentions Positive Neutral Negative
12%
73%
15%
The game is praised for its complete lack of monetization, featuring no microtransactions, advertisements, or pay-to-win elements. It operates as a free-to-play title funded solely by donations, ensuring a fair and community-focused experience. Players appreciate the absence of any monetization schemes, making it a rare find in today's gaming landscape.
“No microtransactions and it's free; the game finances itself only with donations, so you can be sure that they care about their community.”
“Zero-K is a free-to-play RTS game with no pay-to-win and no in-app purchases.”
“This means that there are no microtransactions, no pay-to-play or pay-to-win tricks, or anything like that.”
“As for matchmaking, even if the game is FOSS/transparent and doesn't force unfair match-ups to influence buying microtransactions, there's still the frustrating experience of good teammates then terrible teammates even if the average player ratings between teams are equal, or just high skill differences because of the limited amount of players queuing.”
“I don't usually even look at free-to-play since they are usually riddled with in-game purchase rubbish or are pay-to-win, but I'm glad I checked this out as it has a great Supreme Commander feel to it.”
“No bullshit microtransactions.”
replayability
21 mentions Positive Neutral Negative
71%
15%
14%
The game boasts exceptional replayability, with a vast array of content, diverse gameplay modes, and constant updates that keep the experience fresh. Players appreciate the depth of strategy, unit control, and community-driven content, making it highly engaging for both solo and multiplayer sessions. Overall, it is recognized as a standout title in the RTS genre for its enduring replay value.
“This game has an unbelievably large amount of content and replayability. There's a huge amount of quality of life functions and simple things that can drastically change the way you can play, like giving units queued instructions to move in a spread formation and plan out exactly where they will all move with just a few buttons.”
“Constant updates and rebalancing keep the meta interesting and the replayability high.”
“For a free RTS game, Zero-K has tons of depth, strategy, and replay value.”
“This game has an unbelievably large amount of content and replayability; there's a huge amount of quality of life functions and simple things that can drastically change the way you can play, like giving units queued instructions to move in a spread formation and plan out exactly where they will all move with just a few buttons.”
“I can even say that there is a lot of replayability left in the game after all this time.”
“Better than Total Annihilation, Supreme Commander, and Planetary Annihilation, it has a larger variety of units with more varied gameplay, making this game highly replayable.”
humor
20 mentions Positive Neutral Negative
100%
The humor in the game is widely appreciated, with players enjoying funny emotes, amusing character designs, and clever naming conventions. Many find the chaotic gameplay, such as dying from one's own nuclear explosions or creating humorous strategies, to be a source of laughter. Overall, the game's lighthearted tone and comedic elements contribute significantly to its entertainment value.
“The amount of robots in this game is amazing and the jugglenaut is funny looking.”
“You can modify the terrain, turn the entire map into a wasteland through hours of attrition, and build a funny meme machine to harass your opponent from outside the range of their artillery.”
“I never thought dying to your own nuclear power plant explosions could be so funny.”
stability
17 mentions Positive Neutral Negative
24%
76%
The game's stability is a mixed bag, with many users reporting frequent bugs, random freezes, and visual glitches that can detract from the experience. While some players appreciate the overall gameplay and performance, especially on Linux, the inconsistent stability and occasional frustrating controls are significant concerns. Overall, potential players should be prepared for a buggy experience, though some believe improvements may come in future updates.
“The game runs great on Linux, but you can't install it from Steam yet; grab it from itch.”
“It runs great on my toaster even with the high enemy count!”
“Can't really complain, the game is free and bug-free :)”
“Only issue is that the game randomly freezes and blacks out my PC.”
“This game is so buggy, no point to play.”
“Honestly, it's okay... but it's buggy, annoying, and can be super unfair sometimes.”
grinding
14 mentions Positive Neutral Negative
50%
50%
Reviews indicate that grinding in the game is extensive, often requiring significant time investment, with some players humorously suggesting it feels like needing a "second life" to manage it. However, the game offers quality of life features that automate tedious tasks, allowing players to focus more on strategic gameplay rather than repetitive actions. Despite these improvements, competitive play can still feel grindy, particularly with certain overpowered strategies dominating the metagame.
“You'll need a second life for grinding.”
“The 1v1/2v2 small map metagame is a little stale and grindy when played competitively. Cheap raider spam is completely broken in my opinion; I've beaten game developers and some of the top 25 players in the world by spamming out cheap raider cloakbots. They deal way too much damage for their cost, and three of them can level every resource structure in a base. They're faster than most other units.”
“I actually enjoy tedious mechanical tasks, but I don't think they really serve a purpose. Zero-K seems to minimize non-decisions, which is great.”
emotional
3 mentions Positive Neutral Negative
100%
The emotional aspect of the game is highlighted by the deep connections between characters, such as the relationship between Googlefrog and aquanim, and the struggles of shaman with mental health, which resonate with players. Many users report being moved to tears, reflecting on nostalgic memories from previous games like Supreme Commander, indicating a strong emotional impact.
“This strategy game is so good, it actually made me cry a little because of all the memories this revives from Supreme Commander 1 & SupCom 2.”
atmosphere
1 mentions Positive Neutral Negative
100%
The atmosphere is characterized by a sense of negativity and hostility, with users noting that trolling has reached extreme levels, contributing to an overall unpleasant environment.