
Shortly after, the main version's intro screen was modified to include the then-newly-launched Tetris logo otherwise, gameplay mechanics and graphical interface remain the same. It was later discontinued on June 28, 2021. On April 17, 2019, Tetris and Sanrio announced a multi-year partnership, and a re-skin of the version featuring Hello Kitty and several other Sanrio characters was released on June 3, 2019. On March 2018, a re-skin of the version featuring American singer-songwriter Madilyn Bailey as a promotion for her single "Tetris" was quietly launched. The finished version went live on February 2015, and the game originally ran on Adobe Flash Player before switching to HTML5 on January 2017. The prototype version initially required Unity Web Player to run the game. Tetris () began development on July 2014, as a replacement for the existing N-Blox game found on Tetris's official website. Scoring follows the current system for guideline games. The game uses move reset lock delay, in which a movement or rotation of a piece will reset the delay, making it still active until either the delay runs out or the piece is moved or rotated 15 times. Afterwards, lock delay decreases (whereas the initial lock delay is about a half second), while ARE is still constant. The gravity reaches its maximum ( 20G) at level 20.

When the level increases, so does the gravity. The game ends when the player tops out or clears at least 300 lines (if starting on level 1). Starting the game at level 1 or level 5 is recommended for scoring purposes. For example, it takes 140 line clears to reach level 15 when starting at level 1, and 100 line clears to reach level 15 when starting at level 5.

The level increases every 10 cleared lines. Marathon mode can be started at levels 1, 5, 10, 15, 20 or 25. The game features three different versions of Korobeiniki as the background music, and has a local high score table where you enter your initials. Controls are customizable and so are auto-repeat delay and auto-repeat speed (ARR). It can be played with keyboard, mouse, or touch controls.

The game follows the rule set of the Marathon mode known from older games.
