Use any hex editor apps that are available for android and change the value of HEX Dword to any amount you want.
Score HEX 70 d4 69 a9 Dword
If the codes doesn't work, it is possible that your android version is not compatible with the code I provided above.
Fortunately you can do it manually! To do it manually, increase your score in The Line Zen that is greater than zero. Press pause and use search function in your hex editor app, enter your current score value in The Line Zen and search for it (choose DWORD). If you see a long list of results, just repeat the process until you get 1 result only.
You can change the score value to 9999 or anything you want.