Not too much to go into here with regards to this particular iteration of the game we all got addicted to when Game Boy first came out.
This version of Tetris seems to have been a pet project by one of the coders over at Crystal Office.
If you don't know Tetris or have never played the game before on the NES or Game Boy, then why not get your feet wet and take a walk back in time to the days before cell phones?
Either, this is Tetris Free!Compability and license
Crystal Tetris is licensed as freeware for the Windows (32-bit and 64-bit) operating system / platform from puzzle games without restrictions. Crystal Tetris 1.73 is available to all software users as a free download (Freeware).
Compatibility with this tetris game widget software may vary, but will generally run fine under Microsoft Windows 10, 8, 8.1, 7, Vista and XP on either a 32-bit or 64-bit setup. A separate x64 version may be available from Crystal Office Systems. This download was signed by Crystal Office Systems and distributed as tetris.exe.
We have tested Tetris 1.73 against malware with several different programs. We certify that this program is clean of viruses, malware and trojans.