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I reckon you should start over from the beginning and save up to buy a gold
icer and oven and that is all you will need for the whole game in terms
of icers and ovens, its a waste of time having lots of slow ovens and
icers. Also buy later on a tv and a fridge and cookies as back up, ive
managed to get expert on every level so far and im on the sixth door.
Also
you want fast feet, but theres actually a cheat to getting those for
free. You buy them, then purposely fail the next level, and when you go
back to the buy screen, you have the upgraded shoes but your money has
been returned.
Also, if you were like me, and didnt realise
that you didnt have to buy all the types of ovens before you can get
the upgrade. You can actually click on the up arrow which is above the
picture of the oven or whatever when you click on it, and it shows you
the avaliable upgrades, so you can skip buying the slower ovens and go
straight to buying the fastest ones.

I found it so easy after this, also i suggest doing egypt and the robin hood ones first cos they tend to be harder. ANd the prehistoric one last, and england second to last.