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In order to be able to open the kitchen and stove and read the receipt, you need to set the weights on the scale mechanism. MaG's walkthrough states:
The stove in the kitchen has a square and a duck on the door. Based on the sampler, the square's number is 4 and the duck is 1.
They are the 3rd and 4th light, so there's a need to use only 3 slugs and then 4.
Place 3 + 8 on one pan and 7 on the other. This lights up the square.
Place 1, 2 on the pan with 3 and take out 8, leaving 7 alone on the other pan (1 + 2 + 3 on one pan and 7 on the other). This lights up the duck.
You should now be able to open the stove.
