Scott, Allan; Stege, Ulrike; van Rooij, Iris (2011-12-01). "Minesweeper May Not Be NP-Complete but Is Hard Nonetheless". The Mathematical Intelligencer. 33 (4): 5–17. doi:10.1007/s00283-011-9256-x. ISSN1866-7414. S2CID122506352.
See also, for example, the informal proof given in Scott Aaronson's lecture notes from his course Quantum Computing Since Democritus.
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Scott, Allan; Stege, Ulrike; van Rooij, Iris (2011-12-01). "Minesweeper May Not Be NP-Complete but Is Hard Nonetheless". The Mathematical Intelligencer. 33 (4): 5–17. doi:10.1007/s00283-011-9256-x. ISSN1866-7414. S2CID122506352.
Scott, Allan; Stege, Ulrike; van Rooij, Iris (2011-12-01). "Minesweeper May Not Be NP-Complete but Is Hard Nonetheless". The Mathematical Intelligencer. 33 (4): 5–17. doi:10.1007/s00283-011-9256-x. ISSN1866-7414. S2CID122506352.