Arbitrary Code Execution

After 40 years, Super Mario Bros speedrunners discover "the Holy Grail of glitches"

Speedrunners have discovered a significant glitch in the original Super Mario Bros., dubbed "the Holy Grail of glitches," after a year of research stemming from a similar discovery in Super Mario Bros. 2. This arbitrary code execution exploit allows for extensive manipulation of the game's code, though it is not practical for standard speedruns due to its complexity and time investment.