Thumbs up, by Taran Adarsh, Bollywood Hungama : ...404 is yet another innovative story with a taut screenplay, riveting direction and applaud-worthy performances as its strong points. ... full review

Thumbs up, by Ankur Pathak, Desi Martini : ...Do not commit an error by not visiting this one in the theatres. It wouldnt be same back home. ... full review

Thumbs up, by Mihir Fadnavis, DNA : ...slow, but sufficiently compelling... full review

Thumbs up, by Sukanya Venkatraghavan, Filmfare : ...404 raises some interesting questions about science and what lies beyond its logical boundaries.... full review

Thumbs up, by Nupur Barua, fullhyd.com : ...Tisca Chopra is a natural, and she tries her best to make her rather wishy-washy role interesting.... full review

Thumbs up, by Pankaj Sabnani, Glamsham.com : ...Savita Singh's cinematography is good. Sarvesh Parab's editing could have been tighter in the second half.... full review

Thumbs up, by Divya Solgama, Gomolo.in : ...Dum hai Mind Blowing Dum hai, but for a niche audience only who likes meaningful and good cinema. ... full review

Thumbs up, by Mayank Shekhar, Hindustan Times : ...Soup for the chickened-out soul... full review

Thumbs up, by Shubha Shetty-Saha, MiD DAY : ...Kamath tends to go overboard at some points, but nevertheless, surprises with his acting capability. Imaad Shah is perfect and stays away from overdoing it though his character provides ample opportunity for exaggeration. ... full review

Thumbs up, by Subhash K Jha, Now Running.com : ...breaks cliches of horror genre, a must watch! ... full review

Thumbs up, by Mansha Rastogi, Now Running.com : ...definitely deserves a watch and should be encouraged for its efforts. ... full review

Thumbs up, by Preeti Arora, Rediff : ...a must watch for all 'thriller' fans. And also horror buffs! ... full review

Thumbs up, by Sonia Chopra, Sify Movies : ...A must-watch for those looking for an intelligent, immersing supernatural thriller. ... full review

Thumbs up, by K N Gupta, SmasHits.com : ...fascinating.... full review

Thumbs up, by K K Rai, STARDUST : ...A good fare.... full review

Thumbs up, by Nikhat Kazmi, Times of India : ...no where does the story lose its realistic feel, be it in terms of setting, narration or performances... full review

Thumbs up, by SpiceZee Bureau, Zee News : ...Kudos to Savita Singh’s for breathtaking cinematography and Sarvesh Parab’s tight editing. ... full review

So-So, by Aparajita Ghosh, Apun Ka Choice : ...engaging thriller... full review

So-So, by Bobby Sing, Bobby Talks Cinema.com : ...A fine one time watch experimental movie, but only for a tiny section of viewers.... full review

So-So, by Rajeev Masand, IBN Live : ...Almost works!... full review

So-So, by Namrata Joshi, Outlook India : ...The movie grips you, thanks to efficient performances by Tisca Chopra, Imaad Shah and a host of unknowns. ... full review

So-So, by Reel Reptile, Upper Stall : ...With the 16 mm grainy look working wonders for the required atmosphere, cinematographer Savita Singh does a decent job of letting the camera drift along aimlessly to much effect only to be thwarted by disillusioning voiceovers of supposed conversations that are taking place simultaneously. ... full review

Thumbs down, by Gautam Chintamani, Buzz in Town : ...Like many of those instant bestsellers 404 takes just about everything under the sun in order to string a story but it doesn’t work as well. ... full review

Thumbs down, by Shubhra Gupta, indian express : ...This could have been a nicely understated, seriously scary chiller. But it gets too wordy and too deliberate for its own good. ... full review

Thumbs down, by Komal Nahta, koimoi : ...will win critical acclaim but not box-office rewards.... full review

Thumbs down, by Sanjukta Sharma, Live Mint : ...There are way too many expository scenes, slackening the pace substantially.... full review