Zig zag ramp with tumbling cars. A fun gravity toy for children who are still too small to be trusted around marbles. I strongly suggest *not* demonstrating this toy for your child. You might be surprised how satisfying they find the activity of pushing the cars UP the ramps and threading them through the holes!
Small cars still fit through a toilet paper tube, so this is technically still a choking hazard, but much less likely to cause trouble compared to a marble run.