While not true chiptune (it uses sampled instruments), its low-fi quality overlaps stylistically.
The obsession with the Wii Sports soundfont is part of a larger movement. It sits alongside the (gritty, 16-bit funk) and the Super Mario 64 soundfont (airy, plucky, bright). wii sports soundfont
Most Wii Sports music was originally "streamed" (pre-recorded audio) rather than sequenced MIDI, but dedicated fans have extracted or recreated the instruments into downloadable SoundFonts. While not true chiptune (it uses sampled instruments),
The primary components of this soundfont include: this is a popular community-curated pack.
: Available on Musical Artifacts , this is a popular community-curated pack.