Good games for teachers to play with students in study halls include "Heads Up, Seven Up," "Four Corners," "Around the World," "Hangman," and "Hot or Cold." For smaller groups of students, card games and board games work well. For classrooms with technology, teachers can utilize the SMARTBoard.
A quick Google search will provide instructions for all the games mentioned above. Teachers can also search for SMARTBoard games through the SMARTExchange website. Ideal games for study halls contain educational elements, challenge students in visualization, logical reasoning, or other valuable skills, and interest them enough that they are not tempted to misbehave.