913. Create a rollercoaster map that takes you through, and transports you between, multiple dimensions - all 3 vanilla dimensions, plus at least 2 others. This could be from a range, including Aroma's Mining Dimension, The Erebus, The Last Millennium, the Deep Dark, Thaumcraft's Outer Lands, Kami's Bedrock Dimension, and of course the full gamut of dimensions that RFTools has to offer
Bonus points for using modded carts and/or tracks, and having sights/displays/environmental things unique to modded - such as passing through a grid of lasers from Actually Additions, coasting over a sea of molten metal, or bouncing around using launcher tracks!