Once you get to Level 4, the game ramps up in difficulty to an unfair degree. It took me 3 days to beat Level 4 and what was my reward afterward? A freakin' BOSS BATTLE. No bonus level to stock up on lives or anything like that, nope just throw me into the deep end with my measly little 4 HP and good luck. No matter how many lives you have going in, they're gonna be drained very quickly due to inputs that only respond sometimes. If they do respond, it's the wrong input, so I end up pressing the ! Button instead of the 🤜 Button and get clobbered by one of the construction workers with a pipe. I'm sure other people would probably appreciate the challenge, but it's way too early in the game for that, imo. It was barely the 1st world. More frustrating than fun, but it WAS somewhat fun, therefore my rating reflects that: it was somewhere in the middle.