Maps on gamefaqs: https://gamefaqs.gamespot.com/nes/931300-jurassic-boy/faqs

Level exits:

1-1 -> 2-1

2-1: Highest exit: 2-2 Middle exit: 2-2 Lowest exit: 3-2

2-2: Highest exit: 1-1 Middle exit: 3-2 Lowest exit: 3-1

3-1: Highest exit: 3-2 Lowest exit: 4-1

3-2: Highest exit: 4-2 Lowest exit: 4-1

4-1 -> 4-2

4-2 -> End