Wii VC Round-to-Zero
Wii VC Round-To-Zero is a special phenomenon caused by emulation inaccuracy exclusive to Wii Virtual Console (Wii VC). This is a new glitch discovered on May 28, 2018, that contributes to the A Button Challenge.
In the Wii Virtual Console, it is possible to raise the moving platform at the beginning of BitFS, due to a rounding error that is unique to the Wii Virtual Console. It is believed this happens because the Wii doesn't round double precision floating point numbers to the nearest single precision float, as the N64 does, but instead rounds to the one closest to zero (truncation). Since the moving platform is below 0, it tends towards it. It is possible to use a dive recover in about 8 days, and it is possible to use VSC with a lava boost in 3 days.
The glitch was discovered by Andru! when he went to sleep leaving the Wii powered on for several hours in Bowser in the Fire Sea (BitFS), and found that the oscillating platforms had left their original positions.[1]
Applications
Currently, only the blue moving platforms in BitFS and LLL on Wii Virtual Console are known to have this property. The original N64 and the Wii U Virtual Console do not have this rounding error.
The glitch was fully console verified RTA on 06/20/18 by ethanwhitesm64,[2] and used by Pannenkoek2012 to collect the red coin star 0x 6 days later using a modified N64 emulator that replicated the rounding error.[3]
The first attempt, by ethanwhitesm64, failed because he DR'd to early and missed the platform.[4]
The second attempt, by barruuuu, failed because after a successful DR, he overshot the elevator and when he ran back, he fell through the hole.[5]
The third attempt, by Switchpalacecorner, failed because after a successful DR, the top moving platforms loaded and moved down below the lava. While it is possible to get the next platform using the side ledges, Switch missed it and fell down back to the first floor.[6]