This is a fun and engaging way for students to practice the the imperfect and the preterite in Spanish. I call this shipwreck. The board has 100 squares and there are subjects and infinitives in each box, as well as (p) and (i) to indicate the tense. Students play against an opponent and choose a box. He then says or writes the correct verb form. If the opponent agrees that it is correct, the player gets to color in the square with his colored pencil, then it is the opponent's turn. If the opponent does not agree with the response the teacher is summoned to verify. If the answer is not correct the player loses that turn. When a player gets three boxes in a row of his color he gets a point, which is recorded on the bottom. Each player has a different color and employs a blocking strategy to try to prevent the opponent from getting three boxes in a row. I usually have students make a complete sentence including an adverb to distinguish the preterite from the imperfect.