Best Gravitrax expansions or add ons

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DS is getting a Gravitrax starter set for Christmas, and I wondered which expansion sets or add ons are the most fun. Thanks!

I've got the same question. There to be so many it would be good to know which are worth adding.

I searched the threads on here, and there seemed to be some consensus that they were all pretty good, with the possible exception of the trampoline. I had a look at the starter pack, and I think we'll actually have quite a bit of fun with that before we decide on an add-on or two 🙂.

Let me know what you think if you do go for any!