|A fact from Tetris appeared on Wikipedia's Main Page in the Did you know? column on 24 December 2018.|
Hi. I added a template that says the **references** needs to be cleaned up.
Many of the references contain only a title, and useful information are missing. For websites / web pages, at least the URL should be provided. For other publications, for example, books, magazines or periodicals, it should follow a standard format which often require at least the source's title, author and date of publication included in the reference.
If anyone can locate the original sources of these references, please help adding these information back. Thank you!