text: #ifndef _blocks_h_
  #define _blocks_h_
  
  extern char TBLK_J;
  extern char TBLK_L;
  extern char TBLK_T;
  extern char TBLK_S;
  extern char TBLK_Z;
  extern char TBLK_I;
  extern char TBLK_O;
  
  #endif // _blocks_h_
  