From the self-reflection form, Crossword and Jigsaw games are the most favorite games for learners and some games such as storytelling game and 20 questions games are not suitable for learners. The games which have clearly instruction, easy to understand, take a short time to play can encourage learners to participate and learners can remember more words easily. The games which have confusing instruction, take a long time to play and hard to understand can’t let the learners participate the games and remember words. Cheating players, such as using Thai language in class or breaking the rules, can discourage the other players and make them not to learn appropriately. Strictly and clearly instructions and rewards can eliminate this problem. This can be supported by Huyen & Nga (2003), and Linse,(2006), that is unclear instruction, lack of cooperation of learners and using L1 while playing games were the problems, which were always found while playing games in classes. Clear rules, appropriate and inappropriate concept in class, reward offering can control classroom easier and cause successful learning language in appropriate way.