As this update was specifically for the Codex version, the following changes were made:
(Up, Up, Down, Down, Left, Right, Left, Right, B, A) to unlock a stage themed after the original 1984 version. 1989 Stage : Reaching player unlocks a classic Game Boy-style level. Steam Community Troubleshooting Tetris® Effect - Achievement Guide - Steam Community tetris effect update v1 0 5 2codex