While browsing across facebook apps I found a javascript based game which can be tricked by modifying its script. Here is tutorial on how to cheat on this game. I have used Firefox browser and Firefox add-on firebug.
First open a game called Challenge Click . After the page is fully loaded activate firebug and search for  code below:

fbjs_sandbox.instances.a184094167325.bootstrap();return[fbjs_dom.get_instance(this,184094167325),function(a184094167325_event) {a184094167325_click()},184094167325],new fbjs_event(event));

and replace it with this code

for(i=0;i<1000;i++) { fbjs_sandbox.instances.a184094167325.bootstrap();[fbjs_dom.get_instance(this,184094167325),function(a184094167325_event) {a184094167325_click()},184094167325],new fbjs_event(event));}

Here I have surrounded a code inside onmousedown function for loop which loops 1000 times. You can also do this hack in other facebook games by looping onmousedown function with (i=0;i<1000;i++){ code here } also remove removed “return” otherwise the loop will not execute.

This can also be done is Game Beer competition,
For that game search for

fbjs_sandbox.instances.a179779104589.bootstrap();return[fbjs_dom.get_instance(this,179779104589),function(a179779104589_event) {a179779104589_mclick()},179779104589],new fbjs_event(event));

and replace with

for(i=0;i<200;i++) { fbjs_sandbox.instances.a179779104589.bootstrap();[fbjs_dom.get_instance(this,179779104589),function(a179779104589_event) {a179779104589_mclick()},179779104589],new fbjs_event(event));}

Now make some high scores!! Don’t forget to share this with your friends.

Click here for Cricket Master Blaster cheat