The Magnetix iCoaster is the first DIY magnetic roller coaster complete with drops, jumps, loops, and, fully customisable DJ mixes.

The idea is to build your coaster using the various sections of track, stunt pieces and towers for your coaster cars (metallic balls) to be propelled along.

So far, so let's-make-physics-fun, but the "i" prefix comes into play with the built-in speakers that not only offer 100 musical combos to accompany your action, but has an input for an audio source so you can play your pod's tunes through the system.

Quite random, but apparently very compelling, the iCoaster is £80 from Firebox now.