When I pressed “L” it looped between levels 1 and 2, I did not go to level 3, 4 and 5. The way you fix it is to go to File —> Build Settings —> Add open scenes. Add the rest of the levels and they’ll be given an index. Just thought I’d share in case someone had this problem, have been busy in rthe last two weeks so I forgot that you could do this.
