There was this old arcade game that I played on a ferry back in the mid 90s. It was a linear action platformer where you're short, stocky knight in blue or grey armour - it vaguely reminded me of the action segments of Keith Courage in Alpha Zone. I think you went left instead of right as well, but I'm not sure.
It had roughly SNES level graphics.
Another thing, which sets it apart from most arcade games; it was long
. Even though the machine was broken and permanently set to free play, and I had a full day to play it on and off (taking turns) we still never managed to beat it.
Does any of that sound familiar? I know it's pretty vague, but G&T does have a reputation, after all.