Dice mechanic for tabletop role-playing games

Simul: roll high to succeed.
Or-under: roll equal-or-under to succeed.
Player Party Advantages

If new to tabletop Role-Playing Games (RPG), try playing Dungeons and Dragons, Star Wars Roleplaying Game, or Traveller role-playing game.

'Or-under' and Simul both use "Us versus Them" dice mechanics for tabletop role-playing games with polyhedral dice.

Enter comparable, non-zero, positive numbers as strength levels for "Us" and "Them", where "Us" refers to all players plus their friendly allies and "Them" refers to all opposing forces.

Optionally enter additional advantages unique to either side.

From bronze age armies to sci-fi space fleets, "Us versus Them" handles any comparable opponents. For example, if your space fleet with 5 capital ships faces an enemy with 7 capital ships then Us=5 and Them=7. Similarly if your 100 soldiers face 80 enemies then Us=100 and Them=80, but if your soldiers fight with twice the skill of normal troops then enter Us=200 and Them=80.

Before rolling the Game-Master (GM) normally asks players to state their intentions. Players then simultaneously roll dice after saying, “Ready, steady, roll!” The GM can also interpret the numbers rolled to narrate individual contributions to an overall result.

In addition to conflict between both individuals and groups, "Us versus Them" also models any competition where numerical values can express relative prowess, such as social, psychological or technological.

With six or more players, consider breaking your group into multiple smaller games. For unavoidably large groups, please see 'Or-under' up to Nine Players and Simul up to Nine Players.

Both 'Or-under' and Simul foster party cooperation as every player rolls their dice in the centre of the table at the same time, thus providing a collaborative focus for the simultaneous resolution of actions.

For more information see print directory.

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