| | Surfing and Wallstrafing – Half-Life Physics Reference (jwchong.com) |
| 1 point by cwaffles 4 months ago | past |
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| | Half-Life Physics Reference (jwchong.com) |
| 2 points by cwaffles on June 15, 2023 | past |
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| | (Unofficial) Half-Life Physics Reference (jwchong.com) |
| 1 point by nudgeee on Dec 19, 2020 | past |
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