Mothra, the way I did it was to put the "3 move" sun, put it on tile just before the spider so it "catches", then quick, catch the 2 move sun, put it on so that it catches, then repeat, quickly, until he gets to the end and it stays still.
You want to use your largest move suns as fast as you can, doesn't matter if it's 2 or 3.
It's a bit tricky but not so hard if you know it'll work. It's the not knowing if you are doing something that could possibly work that drives us crazy, isn't it?
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Kathy O