Brilliant game - really relaxing and engaging little construction / puzzle game. The expert models give a decent challenge too. The pricing of additional models (up to £3.79 for a single digital model although some are bundled together at a discount) seems quite high at first. However once you start to build these models, look at the cut-away views and watch the animations, it's clear a lot of work has gone into them and the price seems justified. I hope the author adds more models in the future! Enjoy it!