| fun-package | Use R for Fun | 
| alzheimer_test | Test Alzheimer's disease by finding out the different character in a character rectangle | 
| fun | Use R for Fun | 
| gomoku | The game of Gomoku, a.k.a Five in a row | 
| htmlspecialchars | Replace HTML special characters with HTML entities | 
| lights_out | Play the "Lights Out" game in R | 
| mine_sweeper | Play the Mine Sweeper game in R | 
| random_password | Generate a random password with a specified length | 
| shutdown | Shut down the operating system with the command 'shutdown' | 
| sliding_puzzle | Sliding puzzle in R | 
| tagData | Tag information of Yihui Xie's English blog | 
| tag_cloud | Creating Tag Cloud in R (with Flash and JavaScript) | 
| tower_of_hanoi | Demonstrate the Tower of Hanoi puzzle in R |