Great quiz but just to be pedantic, if travelling by land you would not be able to go from Poland to Russia and then to China. Presuming you travel from Poland to the Russian enclave of Kalinigrad then the next step would have to be Lithuania and then either Belarus or Latvia and then onto Russia..
I was confused for a while because you have Portugal at the top of each column. I assumed I had to keep typing Spain. Why do you have that on each column?