User blog comment:DVSA/Daily Challenge Idea/@comment-5199397-20120820120317

Here's a different idea: its over 9000, beat monkey lane on easy 1-85, only towers that have upgrades on either path adding up to over 9000 cost will be allowed. For example-

The tack shooter will not be allowed, as none of the paths cost over 9000.

The boomerang thrower almost makes it.

The super monkey, monkey wizard, bannana farm, ect. has both paths costing over 9000, so both paths are allowed.