Modding

Modding (short for Modification, also known as Hacking) is the act of updating a game's (or in this case, Smash Hit's) files in order to add new content to the game, fix bugs and add features. While Smash Hit modding is not officially supported by the developers, they have previously expressed that they are okay with modding, so long as it is not giving users anything that would be paid for free.

Early History
It is not known when the first Smash Hit mod was created, though it is likely to guess that it was around Smash Hit's release; however, no mods were known to be published to the internet before 2020.

2019
In June 2020, NZMC published a video which claimed that Custom Hit was the first ever known Smash Hit mod. Also in 2019, Knot126 claims that he had started to work on modding Smash Hit and was able to load the debug menu in December.