I made NyanCat with Japanese Smile BASIC ver 3.0
When Smile BASIC first came out in Japan, L/R button SAVE/LOAD was not available.
So I changed F3 key to save current program.
After I submitted my game for contest, Smile BASIC was updated to ver 3.1 and it caused error for sprites without SPSET initialization. (I forgot to add SPSET for those sparks)
I added missing SPSET and reuploaded fixed version right afrer the contest was over.(but forgot to update youtube page)
Here is SPSET bug-fix public key: D35DXHD