Various research groups* have used toys as robotics hardware platforms in order to cut costs. I bought a "Tiger Twister stunt vehicle" (Speed Well International Industrial Ltd.) because it is supposed to be able to climb stairs and is large enough to carry a Raspberry Pi single board computer. I find that the Tiger Twister does (for the first time) give me a limited stair climbing capability** provided that the stairs are not too slippery.
* For example: Hogg, Martin, and Resnick, Braitenberg Creatures, MIT Media Lab, E&L Memo report #13, June 1991. Connell, Creature Design with the Subsumption Architecture, International Joint Conference on Artificial Intelligence, pg 1124, August 1987. Dawson, Dupuis, and Wilson, From Bricks to Brains, UBCPress, May 2010. my blog of 8 Jan. 2018.
** There are LEGO robot designs that also have limited stair climbing capability.
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