Help! Brand new lib file

Hello, can someone please tell me how this works? I found a new lib file in the modified version of Subway Surfers. When I put all the original lib files from the original game into the lib folder, the hacks still work, so the original lib files were not modified. But when I delete the new lib file and in the main activity the lines that refer to the new lib file, the toast doesn't appear anymore and the hacks don't work either. How does this work please?