

You can compare the checksum of your Super Mario Bros.
#SUPER MARIO DELUXE ROM PATCH PATCH#
The “Spiny Egg Speed” patch should be applied to an unheadered NTSC copy of Super Mario Bros. (See also: MVG’s response to that discovery) Similar decompilation efforts with Super Mario 64 recently yielded a patch that fixed a twenty-four year old bug adversely affecting the way smoke was rendered, and also led to the discovery that game code in the Japanese and North American releases could be further optimized for a small performance improvement. Bugfixes like these are being released with greater frequency thanks to community efforts to decompile, reverse engineer, and explore the source code of popular games an important step in the preservation and long-term viability of video games as a medium. was released in Japan in September 1985, which means this bug went undiscovered for a little under thirty-five years. However, this is not the intended behavior, and is actually the result of a bug! The eggs are supposed to be thrown out relative to the player’s speed, Lakitu’s speed, the player’s position, and a pseudo-random value, as well as bounce off of any blocks or walls that they hit on the way down.”

“The Spiny eggs are thrown by Lakitu in a simple way, with no horizontal movement whatsoever. (NES) that fixes a bug in the code that governs Lakitu’s behaviour when throwing spiny eggs: GoldS, an admin and writer at video game research wiki The Cutting Room Floor, has released a patch for Super Mario Bros.
