Gamma World vs Nimble
Compare Gamma World and Nimble side by side. See differences in complexity, dice, genre, and more.
| Gamma World | Nimble | |
|---|---|---|
| Genre | Post-Apocalyptic, Sci-Fi | Fantasy |
| Tags | Superpowers, Random Character Creation, Classless, Gonzo, Comedy, Tactical, Grid-Based, Combat-Heavy, Beginner-Friendly, Deadly | Tactical, Fast-Paced, Heroic, Combat-Heavy, Grid-Based, Character Building, Classic Fantasy, Beginner-Friendly, Strong GM Support, Low-Prep |
| Core Mechanic | Roll a d20 and add a modifier, then compare the total to a target number or one of four defenses: Armor Class, Fortitude, Reflex, or Will. Two randomly rolled character origins combine to set starting ability scores, skills, and powers instead of a chosen race and class. Alpha Mutation and Omega Tech cards drawn from a shared deck grant each character's most powerful and unpredictable abilities for the session. | Skill checks and saves roll a d20 plus the relevant skill or stat against a DC. A natural 1 always fails and a natural 20 always succeeds. Attacks skip the to-hit roll: roll the attack's listed damage and deal the total. On most attacks, a 1 on the leftmost Primary Die misses and a maximum on that die explodes into a critical hit. Advantage and disadvantage add dice of the same type and drop the lowest or highest. |
| Dice | d20 | d20 |
| Complexity | Medium | Medium |
| Availability | Paid | Free quickstart |
| Runnability | 5 of 5 book tools | 4 of 5 book tools |
| License | Proprietary | Nimble 3rd Party Creator License v2.0 |
| Third-Party Publishing | Not yet researched | Commercial publishing allowed — Creator license |
| Summary only, not legal advice. Check current terms before publishing. | ||
| Publisher | Wizards of the Coast | Nimble Co. |
| Year | 2010 | 2025 |
| Languages | English | English |
| Best For | Groups who want a silly, fast-paced pickup game with randomly generated mutant heroes rather than a long-term character build. | Groups who want class-based heroic fantasy with tactical grid fights and no separate to-hit roll. Also a good fit for a group whose GM is running a game for the first time. |
| Highlights | Alpha Mutation and Omega Tech cards replace a fixed power list, so a character's abilities shift unpredictably as cards are drawn, used, and discarded between encounters. Rolling two random character origins instead of choosing a race and class produces unplanned combinations that push players toward improvised character concepts. A hundred-item Ancient Junk table turns ordinary scavenging into a steady stream of small, flavorful rewards between the rarer Omega Tech finds. | Heroic Reactions such as Defend and Interpose normally cost one of a hero's three actions, so reacting on an enemy's turn leaves fewer actions for the hero's own turn. Assess spends an action on a skill check to ask the GM a question that must be answered honestly or to create an opening, bringing roleplay into combat turns. Legendary monsters act after each hero's turn and list HP per hero, so one boss scales to the size of the party. |
| Considerations | Character origins are rolled randomly from a fixed table, so a player who wants a specific concept must ask the Game Master for permission to choose origins instead. The starter box's 80 cards are the only power pool for groups without the two out-of-print expansion kits, capping how many distinct Alpha Mutations and Omega Tech items a table can draw. Running combat means tracking multiple readied and discarded card piles for each character in addition to the four defenses, conditions, and forced movement of the underlying 4th Edition engine. | Movement, reach, and area effects are counted in grid spaces, so gridless play relies on one of the optional movement variants. Damage can swing widely because a single roll decides both whether an attack hits and how much it deals. Outside combat, social and exploration scenes run on skill checks and GM-built skill challenges rather than dedicated subsystems. |