Tubaruba

Hidden message in the game code:
Hi, my name is Tooba Zaidi and I wrote this program in 1985 during the summer holidays when I was a fifth year at school. I hope that you enjoy this game as it took me three months to write. By the way, the secret code is 25 09 68 so dont forget it. And the famous DEC (HL) instruction that you're lookin' for aint there. P.S. I hope that this is NOT A PIRATE COPY ! or else ..

Program: Tooba ZAIDI