Professional ratings| Review scores |
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| Source | Rating |
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| Allmusic | |
| RapReviews | (7/10) |
Hidden Stash 420 is a 2009 compilation album from American hip hop group Kottonmouth Kings. It is their fourth compilation album and includes b-sides, remixes, demos, solo tracks by Kottonmouth Kings members D-Loc and Johnny Richter, and collaborations with other artists. The album comprises 40 tracks on two discs.
The Best Buy edition of the album includes a bonus DVD titled Lost Adventures which consists of two hours of behind the scenes footage and videos.