Tic Tac Toe

Hello there, I invite you to one of the largest online global events in history … the Tic Tac Toe World Championships!

Site : http://challenge.rgbsec.xyz:8974/

Solution

Note : This solution is unintended.

• Act dumb and just play the game
• One winning scenario which worked :

  You : (1,1)
  Bot : (0,0)
  You : (2,2)
  Bot : (0,2)
  You : (2,1)
  Bot : (2,0)
  You : (0,1)
  

• Once you win, the flag is revealed in base64 format
  cmdiQ1RGe2g0aDRfajR2NDJjcjFwN19ldjNuNzJfQVIzX2MwMEx9
• Decode it to obtain the flag

Flag

rgbCTF{h4h4_j4v42cr1p7_ev3n72_AR3_c00L}