Question: can you put a draw 2 on a draw 4?
Answer: Players are not allowed to stack Draw 2 and Draw 4 cards. If someone puts down a +4 card, you must draw 4 and your turn is skipped. You can't put down a +2 to make the next person Draw 6. ... Upon reading, the teacher discovered players are only allowed to play the 'Draw 4 Wild Card'