This is a fun way for students to practice or review the stem-changing verbs in Spanish. The activity is magic squares. There are 16 squares in each grid and each contains conjugated forms of verbs in Spanish. Next to the grid are 16 subject/infinitive verb pairs. The student writes the number of the subject/verb with the correct verb form in the grid. If done correctly, each row, column, and diagonal add up to 34. There are 5 puzzles total on 3 pages. Great as a class starter or for a substitute.