When comparing Microlite20 Purest Essence vs The Pool, the Slant community recommends The Pool for most people. In the question“What are the best tabletop RPGs?” The Pool is ranked 34th while Microlite20 Purest Essence is ranked 54th. The most important reason people chose The Pool is:
Instead of rolling to perform actions such as swinging a sword, rolling is used for resolving intent with descriptions of actions left to players and GM to describe.
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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 Rolls are made to resolve intent not actions
Instead of rolling to perform actions such as swinging a sword, rolling is used for resolving intent with descriptions of actions left to players and GM to describe.
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 Monologue of Victory may stop any GMs plans
The Pool includes a system, called the Monologue of Victory, that allows a player to take over narration of the game in the event of a successful roll without the GM being able to interfere. As such using the system for complex plots may be difficult, because the player may remove an essential part of the story without knowing it.