One player; STW original, closely followed by Civilization. I played the original Civilization for yonks.

Multi-player; Worms. What a hoot when you let the exploding sheep off the leash. Fifa 98, I secretly bought a PS1 and this game so I could practise playing. My eldest son was shocked when he came a visiting and let me play as Brazil against his Man Utd. I beat him 12-0.

Online; STW, hands down. Every battle different.