Tetris Friends

Tetris Friends is a Tetris game available in Facebook.

Gameplay details

 * ARE: No
 * Initial actions (IRS,IHS): No
 * T-Spin detection
 * Unnamed mode (Holiday/Survival): 3-corner T
 * BlockStar mode: None
 * All other modes: 3-corner T no kick
 * Combo bonus: Yes

Marathon
Standard marathon mode with 15 level limit.

If you reach certain level, you can unlock additional skins.

This mode can be played without a Facebook account. However you can't unlock any additional skins.

Sprint
Clear 40 lines as fast as possible. Level is not selectable and fixed to 1.

Sprint 5P
Compete with 4 opponents in Sprint mode. Opponents are just the previously recorded play, and randomly selected based on your current rank.

BlockStar
This mode is remake of the first Tetris game released on Facebook. It has classic game elements: no hold piece, no ghost piece, no lock delay, only one piece preview, endless game time, and more.

Ultra
2 minutes ultra mode. Score as many points as possible within 2 minutes. Music is selectable from 5 songs. This mode was formerly known as Tetris Solo, and 3 minutes mode was also available. Level is not selectable and fixed to 1. Your score will not be recorded if you top out.

Unnamed mode (Holiday/Survival)
This unnamed mode features similar objective as marathon, but has different goal system and different T-Spin detection methods. Level advances by clearing every 10 lines. After you beat 20th level, you'll enter the "Bonus Level". The bonus level is semi-invisible challenge, and the game continues until you top out. T-Spin with wall kick is allowed in this mode. This means T-Spin Triple is possible.

This mode can be played without a Facebook account. However it comes with different graphics and sounds.

This mode has no name, but by exploring the web browser's cache directory, you can find the internal name of this mode. Facebook version is "Holiday" and non-Facebook version is "Survival".

Scoring Strategy
Tetris Friends has a goal system where the way to get to the next level is to clear a certain number of goal lines that increases as the levels do. The optimal way to acheive a high score is using the Single-single combo strategy:

Post specifically about facebook tetris scoring strategy

YouTube - Higher Tetris Splash and Facebook Tetris marathon score's