IronWolf
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3rd Edition (an example of a character at any level):
Opening a Door: D20 vs free-wheeled DC
Bend Bars: D20 vs free-wheeled DC
Picking a Pocket**: D20 vs free-wheeled DC
Open Lock**: D20 vs free-wheeled DC
Find/Remove Trap**: D20 vs free-wheeled DC
Move Silently**: D20 vs free-wheeled DC
Hide in Shadows**: D20 vs free-wheeled DC
Hear Noise**: D20 vs free-wheeled DC
Climb Walls**: D20 vs free-wheeled DC
Read Languages: D20 vs free-wheeled DC
Surprises enemy: D20 vs free-wheeled DC
...
ANY CHALLENGE: D20 vs free-wheeled DC
** Any class under the sun can attempt these.
Why did you ignore the tables under many of these skills that tell you what the DC should be for various tasks? Picking one from your list - Open Lock which you call free-wheeled:
DC20 Very Simple Lock
DC25 Average Lock
DC30 Good Lock
DC40 Amazing Lock
Other skills have these tables as well. The DM of course gets to choose what type of lock it is - but I fail to see how that is a bad thing.