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We are developing games to increase student learning and attitudes in introductory CS courses. Wu's Castle is a game where students program changes in loops and arrays in an interactive, visual way. The game provides immediate feedback and helps students visualize code execution in a safe environment. We compared the game to a traditional programming assignment in an introductory CS course. In our study, half of the students were randomly selected to play the learning game first and half to write a program first. Our results show that students who play our learning game first outperform those who write a program before playing the game. Students in the game-first group felt they spent less time on the assignments, and all students preferred the learning game over the program. These results suggest that games like Wu's Castle can help prepare students to create deeper, more robust understanding of …