Under certain conditions it is possible to perform a spin maneuver where no line
is formed if the player pauses the game at the moment the piece is spun into place.
When unpaused the game will think a line was formed and thus clear lines above
and/or below.
Following is a video showing this in action:
Pause Bug
The screens Celtic and Russia are noticeably slower than the other screens when it comes to forming a gold or silver block and when clearing lines containing gold or silver.
It seems that getting a top 5 personal best score in Marathon will alter your 5th best personal Sprint time to 3:01. I do not know the necessary conditions for this to occur. But I do know that it is not necessary to get over an hour on marathon and not necessary to get a first place personal best in marathon.
No matter how well you do, it seems your rank listed in your personal top 5 for Ultra and Marathon will be 1 for any time less than 1 minute.