When comparing Microlite20 Purest Essence vs Monsters & Magic, the Slant community recommends Monsters & Magic for most people. In the question“What are the best tabletop RPGs?” Monsters & Magic is ranked 42nd while Microlite20 Purest Essence is ranked 54th. The most important reason people chose Monsters & Magic is:
The game uses a single core mechanic, which is flexible enough to cover a wide variety of situations. This helps GMs immensely when characters want to do things that aren't already covered in the system. The mechanic itself works thusly: all rolls are 3d6 + modifiers *minus* difficulty. The result is how many effect points the player can apply to the action -- or, if negative, how many consequence points their opponent can apply to a reaction. Dealing damage is one use of effect points, but there's a limit on how much can be dealt at once, so additional effects (e.g. distracting, disarming, unmounting, etc.) see constant play instead of only being used rarely or by super-specialists. This also means failure is interesting, since it results in consequences! This mechanic is used to do everything, and the game essentially consists of nothing but examples of how to use it.
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Pros
Pro Easy to start
If you are looking for a game like DnD, but much easier - try Microlite20 Pures Essence with Ultimate Fantasy supplement.
Pro Rules will be familiar to any veteran D&D player
As Microlite20 is a stripped down version of the d20 SRD with the same classes, races, items and abilities, it will be easy to understand by anyone that has previously played a D&D game. Especially D&D 3.x.
Pro Compatible with d20 SRD
Any material written for the d20 system can be used with the Microlite20 system. All creatures, items, monsters, spells, etc from any d20 SRD licensed resource are compatible with the Microlite20 system.
Pro Clear writing
The writing is very terse and to the point. There's very little in terms of fluff. As such the rules are easy to comprehend and reference.
Pro Simple rules allow easy customization
m20 remains compatible with the d20 SRD, but rules are lite enough that adding modifications to the system is trivially simple.
Pro The Effect Engine
The game uses a single core mechanic, which is flexible enough to cover a wide variety of situations. This helps GMs immensely when characters want to do things that aren't already covered in the system.
The mechanic itself works thusly: all rolls are 3d6 + modifiers minus difficulty. The result is how many effect points the player can apply to the action -- or, if negative, how many consequence points their opponent can apply to a reaction. Dealing damage is one use of effect points, but there's a limit on how much can be dealt at once, so additional effects (e.g. distracting, disarming, unmounting, etc.) see constant play instead of only being used rarely or by super-specialists. This also means failure is interesting, since it results in consequences!
This mechanic is used to do everything, and the game essentially consists of nothing but examples of how to use it.
Pro Interesting combat
Attacks generate effect points, which you spend to do things to your opponent. However, the amount of damage you can do is limited, which forces players to do other things... and the effect system is broad enough that these can be things like cutting off a carrion crawler's tentacles, knocking an opponent's sword out of their hand, and so on. Failures on attack generate consequence points as well, which your opponent can use to do things to you.
Pro Mental defense and hit points
Characters have a "Mental Defense" score and "Mental Hit Points". These are used to help provide a unified system for handling social encounters and mental attacks via magic.
Cons
Con Combat can potentially get stale
Due to the fact that combat is simplified to just 3 variables (AC, HP and attacks) a less experienced DM runs the risk of creating repetitive combat.
Con Not currently available in print
Is only available in PDF.
Con Few monsters & spells provided
The included rules have only about 20 monsters and 1st and 2nd-level spells. Third party publishers have supplements that provide more, or you can use ones from old D&D.