It's easy to join. Create a slack channel (#pong, #chess, #pool or #tictactoe) and invite the bot (@pongbot, @chessbot, @poolbot or @tictactoebot) to it. Then, from your slack account, invite friends to join your team.
You should address your bot as @pongbot, @chessbot, @poolbot or @tictactoebot. In this tutorial, we will address your bot as @bot for the sake of simplicity.
Step 2: Invite friends for a challenge
Challenges a member of your team by sending: @bot challenge @opponent
Accept the challenge with: @bot accept
Lost the game? Send: @bot lost, in a draw both say @bot draw
Check your rankings with: @bot leaderboard 10 or @bot rank.