Hey there. Did you connect all the connection point's from the start node, to the nodes you want to add, to the end node? (see screenshot for an example)
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Ah, you have ended up in the "game over phase", since the "current time" does not equal the "target time" (top bar). Hit "reset" and add the cogs (bottom area) by dragging the ones you need into the scenes, and wiring them up to get from the start to the end time. - We did have a "game over, try again" screen, but that broke somewhere along the way without us noticing until it was too late to fix.