To add a custom dictionary, you'll have to follow these steps:

1. Download a list of words, it can be the one attached below or anyone you find. If it's one different from the attached, make sure that all words have all letters in uppercase and without accents.
   https://github.com/Ralleg314/Word-Play-Espa-ol/blob/e4eb70aa42b82ba14efef85504afdb855535d39b/customdictionary.txt
   
2. Go to the folder /[YourUserName]/AppData/LocalLow/Game Maker's Toolkit/Word Play
   
3. Add the attached file or save your own as customdictionary.txt

The game is balanced for English words, for this reason, is recommended to add also a custom bag, which will alter the amount of letters of each type that appear in-game, as well as adding the letter ñ.
To do it, you must follow steps similar to the dictionary.

1. Download the following file:
   https://github.com/Ralleg314/Word-Play-Espa-ol/blob/e4eb70aa42b82ba14efef85504afdb855535d39b/customletterbag.txt
   This one was created using the point values and letter amounts found in the Spanish version of Scrabble.
   A new file can be created, changing both the amounts of letters in the bag and the amount of points each letter provides. To do it the pattern to must be as follows: [letter][number of points][number of letters] (for example, M0302 means that Ms will give 3 points and that there will be 2 of them in the bag)
   
2. Go to the folder /[YourUserName]/AppData/LocalLow/Game Maker's Toolkit/Word Play
   
3. Add the attached file or save your own as customletterbag.txt

To check that both the dictionary and the letter bag are loaded correctly, these messages must appear in the lower left side of the screen when starting a game: