Alter tiles is a tile attack introduced in Bookworm Adventures. This attack switches the current letters in the grid. Sometimes switching letters that are less frequently used in the English Language. Luckily, it merely just to switch the letters of the tiles including their value. It cannot switch the gems and/or the negative tiles.
- In Bookworm Adventures Vol. 2, there is a boss, (Sifu Sek Keen) that has the Alter tiles attack used in a unique way. One is that is to switch vowels with consonants and the other one in reverse. However, letters Y and W are considered as vowels.