Can anyone think of a game with a leveling model like this...

Leveling Equation

Level is determined by the equation

L = floor((S ? S0 + 28)/15),

where S equals the sum of your three primary skills, two highest major skills, and highest minor skill, and S0 equals the sum of the starting values of each of those skills. In simpler terms, you must raise the total of these skills by 15 points in order to get a level increase.

Any combination of skill increases will work as long as they total to 15 points. Increases in Miscellaneous skills do not count toward level increases, although the character will still be better at doing those things. Note that the formula counts only the highest Minor skill and the two highest Major skills, so any increases of the other Major/Minor skills do not count toward a level increase until the lower skills reach the same value as the highest.

The 28 points is a quasi-gift from the development team. 15 points of it is necessary since a new character would otherwise have to have 15 skill increases to reach 1st level. The other 13 points means that a new character only needs two skill increases to reach level 2.
A level increase happens after resting. Every time you rest, the game looks at the various counters and decides whether a level increase is appropriate or not.
Skill increases work a bit differently. The game tracks how often you use each skill and increments a counter with each check of the skill, successful or not. When the counter reaches the appropriate point, a skill increase is awarded.
Skills operate under the idea that "the more you know, the harder it is to learn something new." Consequently, the number of skill checks required to gain a skill increase goes up with the skill level. This seems to be in increments of 15%. While the skill is below 15%, very few checks are necessary. It takes a few more checks when the skill is between 15% and 30%, a few more when the skill is between 30% and 45%, and so forth.
The number of required skill checks is also affected by the "Difficulty Dagger". The required number of checks is multiplied by the Dagger setting at character creation (somewhere between 0.3 and 3.0). At 1.0 and with the skill between 30 and 45, about 30 skill checks are required to gain a skill increase.
While level increases happen only after resting, skill increases can happen after resting, loitering, or fast-traveling. However, at least six hours (game time) must have passed since the last time an increase was awarded for that skill.
Once you reach 50% in a skill, you can no longer receive training and must increase your skill through use or magical means.

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