Gamma World vs Railgun XXVI

Compare Gamma World and Railgun XXVI side by side. See differences in complexity, dice, genre, and more.

	Gamma World	Railgun XXVI
Genre	Post-Apocalyptic, Sci-Fi	Sci-Fi
Tags	Superpowers, Random Character Creation, Classless, Gonzo, Comedy, Tactical, Grid-Based, Combat-Heavy, Beginner-Friendly, Deadly	Tactical, Player-Only Rolls, Deadly, Gritty, Mission-Based, Random Character Creation, Beginner-Friendly
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.	Roll d20 and add one of four stats (STR, CRD, AGI, or MND) against a standard difficulty of 12. Every roll is player-facing: players roll to attack and also roll to dodge incoming attacks, so the GM never needs to roll dice. Rolling a natural 20 banks an adrenaline point, which buys an extra action on top of the two each character gets per turn.
Dice	d20	d20
Complexity	Medium	Low
Availability	Paid	Free core rules
Runnability	5 of 5 book tools	2 of 5 book tools
License	Proprietary	MÖRK BORG Third Party License
Third-Party Publishing	Not yet researched	Not yet researched
Publisher	Wizards of the Coast	Nathan Freeman
Year	2010	2026
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 short, lethal firefights on a grid and a GM who narrates enemies rather than rolling for them. Suits a few-session campaign or a drop-in mission night more than a long character-driven arc.
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.	Every roll is player-facing, including dodges against incoming attacks, so the GM runs enemies without touching the dice. Dropping to 0 HP forces a critical injury roll that permanently reduces a stat, so downed characters degrade instead of bouncing back up. Several weapons chain into a free attack when they drop an enemy, making target order a tactical decision rather than a formality.
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.	Social scenes have no dedicated stat or subsystem, so persuasion is settled by player argument rather than mechanics. Play assumes a gridded map with movement and line of sight measured in squares, leaving theater-of-the-mind groups to convert those rules themselves. Out-of-combat scenes lean on ad hoc GM rulings and a single falling-forward technique rather than a dedicated exploration or investigation subsystem.