For This cheat to work, simply download Cheat Engine 5.5 from the link http://www.cheatengine.org/download.php
After downloading, install it,
Open the game in facebook. Run Typing Maniac
Opening Cheat Engine, select firefox or whatever browser you use by clicking that computer icon below the word FILE.
Check the following in the tick box: Enable Speed Hack and play with the speed lever. You can use 0.1 or 0.5 or something.
You will see that the game is easier, because the tiles are coming down Slower.