Let’s say you have a skill with rank R∈[0,101]R R∈[0,101], starting at R0=0R_0=0R0=0. To test the skill, roll a d% and compare: If you roll under or equal to RRR, you succeed. If you roll over or equal to RRR, you learn. When you learn, increase RRR by a=1a=1a=1. Naturally, if you roll exactly equal to RRR, you succeed and you learn. This is substantially similar to the core mechanic of Penny Spent, but broader. I am naming this Fail-to-Learn. Initially, I had intended to submit this...
