When comparing GRIN vs Microlite20 Purest Essence, the Slant community recommends GRIN for most people. In the question“What are the best tabletop RPGs?” GRIN is ranked 36th while Microlite20 Purest Essence is ranked 54th. The most important reason people chose GRIN is:
GRIN uses a a standard deck of playing cards instead of dice.
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Pros
Pro Zero dice required
GRIN uses a a standard deck of playing cards instead of dice.
Pro Narrative focus
With no intrusive dice or math players can focus on the story, with every action being resolved by the simple draw of a card.
Pro Creates excellent tension
GRIN uses a a standard deck of playing cards to create a fast paced and deadly feel that evokes modern horror films. One of the best horror games made, its ideal for Halloween or horror movie nights.
Pro Its great for single session games
Like any horror film, characters will die. Grin lends itself to deadly games and rally shines with 4-6 players and narrative arcs lasting 3-4 hours.
Pro Easy to improvise
With the intrinsic arc of a classic horror narrative built into the core mechanic, Grin can be an intuitive framework for improvised play.
Pro Unique mechanic
In true horror movie style, death becomes increasingly likely as the game's story moves irrevocably forward.
Pro Easy to pick up
The game has just one page of rules. It can be explained in a minute -- even to people who have no rpg experience.
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.
Cons
Con Can be seen as too simple for some
Because each encounter has just two possible outcomes - success or death - there's little wiggle room in terms of roleplaying.
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.