Thanks for trying and for the kind words! The main goal is to carry the frog out of each level as they key npc. This will involve switching on radios, distracting certain npcs blocking your way (by waving at them), unlocking doors, and other things. You may need to switch around NPCs to solve different puzzles (i.e. teachers are allowed in some areas students are not, students can fit some places teachers cannot). If you have the NPCs "talk" to each other, sometimes they drop hints on how to progress in that level.
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Cheers, I tried again, I think I had some sort of bug the first time. No matter who I was taking the first time, I was told they weren't worthy of holding the frog, even with people from the teacher area, so I couldn't progress. But I tried again now and managed to finish the first 2 levels, I was able to pick it up this time. Pretty cool puzzles !