@Gogar Jumping is not a good idea, it never will be a good idea. It would defeat the purpose of being trapped in a hole. Standing on the enemy so they hit themselves is a strategy, and there is a good way to get around it, if you use weapons like the bow, tomahawk, machine gun, etc. you can shoot the enemy on the side they stick out.
Hmm, here's a suggestion. At level 40, you are able to select a weapon that will always be in battle with you. At level 60, you are able to select 2 weapons, and at level 80, you can select 3 weapons.
@people who lose their save data. If you clear your cookies and history and stuff, it's gone. You may not have cleared it, but it's possible others in your house have. Programs on your computer may have cleared it, things like CCleaner have been known to delete your history. Perhaps your browser automatically clears your cookies every day, you may want to check all of these possibilites.
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