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Intend to complete them in easy mode, as they don't have difficulty restrictions.
Looks like it need a large 1:3 map to achieve "Sonic boom" and "Speed of light", since it takes time to reach top speed.
Sounds it will be a stress test on my old laptop.

i3-4010U, 8GB Ram, 960MB SSD, Intel HD Graphics + GeForce GT 720M
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To celebrate 100% achievements reached, I decided to go for it physically with a wooden train model.