An image of the "JSTRIS handling mode" which was included in the Version 6.0.4a update released exclusively on April Fools' 2021. This option no longer exists in TETR.IO's config, so this image was sourced from footage put up on the public TETR.IO Discord server: https://cdn.discordapp.com/attachments/710697310207868929/826955697245650964/TETR.IO_2021-03-31_16-05-22.mp4
A screenshot of what is believed to be the origin of the "T-WIST" action text used for the TETR.IO April Fools' celebration earlier this year. It is taken from GlitchyPSI's YouTube video titled "A casual day with a twist." https://www.youtube.com/watch?v=J5vqc0v5v2o
An image of the "Super Lobby" badge implemented on the 6.0.3 update https://tetr.io/about/patchnotes/ . This is notably different from the "Hard Drop Super Lobby" badge, which one achieves during a set community event. It's internally known as "100players", since "superlobby" was taken by that aforementioned event. This image was sourced from https://tetr.io/res/badges/100player.png