Puzzle
Strategy
Half-Life
Half-Life 2's anniversary update broke a simple speedrunning strat that was in use for 20 years, so Valve has now fixed the 'fix' in a new patch
Speedruns are often reliant on the most random, funnily obscure quirks in any given game. You don't need to look further than the recent Half-Life 2 20th anniversary update for proof, as Valve added a fix to the two-decade-old game that accidentally broke a small speedrunning strategy, and it's now had to fix its 'fix.'