Here you can find levels and add-ons for Rune. Make sure you check the documentation for additional info on how to play them, for instance what map you should load to begin with.
Unless otherwise noted, you should assume that all of these add-ons were designed for the original Rune/Rune Gold. They probably work with the Rune Classic re-release as well, but if you run into any strange problems, try them with Rune Gold. The GOG release of Rune Classic, at least, offers Rune Gold as a downloadable extra.
If you want, you can jump directly to a subsection:
Singleplayer levels by other authors: Collected levels which can be played in single player. These were played to completion to make sure that they work.
Arena-vs-monster style levels by other authors: Collected levels which can be played in single player against monsters, but are based purely around combat with no adventure to speak of. These were just played long enough to get a feel for what they're about.
Modding example levels by other authors: Collected levels which serve as an example of a mod the author has done rather than as a more properly playable map.
Dwarven Treasure Hunt by (BDC)Killzone
Eight maps maps that are ugly, flatly lit, and have quite a bit of weird geometry in some places. The first map is just a descent through a whole bunch of chutes, some of which can kill you if you don't go down them just right, and it's not until the third map that you get to actually pick up a weapon and fight. Starting with the maze level, some of the triggers to take you from one level to the next don't work right, so I had to start loading the next level manually for a few of them, which resets your weapons and powerups but fortunately there's more when you need them, generally. Essentially, this set breaks down into monsterless maps with tricky navigation, big arenas against giant monsters, or more standard but dull levels; the only one that really stands out as having a more interesting plot or scenario is the prison level which was almost slightly worthwhile, but by that time the set is almost over. Not recommended.
Monster-arena levels by other authors
"Sparena" by Richard Woods aka Fragmeat
A customize-your-fight level where you're allowed to pick a weapon, a shield, a type of opponent, and a number of opponencts from one to eight. You can also take rune power, life and berserk powerups before the fight if you want. Once you've made your selections, you go into the arena and hit a gong to activate the enemies you've selected. If you win, you get a message that suggests trying again in a harder fight and the level loops back to the beginning (while letting you keep the weapon and life extension you may have chosen, which seems like circumventing the rules just a bit). Quite well done as this type of level goes.
"GoblinGibz" by Keebma
This level is essentially a small deathmatch-style arena with a raised central crag that has healing items and all the weapons at the top, and some rune powerups on the lower tiers. The single-player experience is just massacreing an endless horde of goblins that spawn in until you die, with none of the adventuring elements you might expect from a single player map.
Modding example levels by other authors
"TestMap" by vitaminc
As the title says, this one is a test map of the author's various modifications. Included are alterations to both weapons and enemies, including an allied warrior who helps you fight the monsters and a couple of spooky red guys with glowing eyes (I guess they're the "monsters from HELL" mentioned in the text file) alongside the more standard zombies and worms. The level itself consists of a main room with weapons and a banquet table, and a couple of side rooms where the tougher opponents are waiting with their line of sight blocked off so they won't come after you until you come after them. The map plays in multiplayer mode so if you get killed, you just respawn with things as you left them. It's too bad this wasn't continued as there were some promising ideas but as it is the experience isn't very substantial.
The author also kindly included a... peculiar screenshot in the ZIP file.
"SP-Vikings" by Anthony "Jetrell" O'Donnell
This is more of an example map than a proper level. The author got the vikings to patrol around by grafting some of the zombie AI onto them. It shows; they kind of shamble/hobble around rather than doing a confident viking strut the way I'd prefer them to. It's also rather buggy in that they don't always alert to the player's presence and can sometimes remain oblivious even as they're getting chopped up, in which case they won't drop their weapons if killed while still in patrol mode. As far as using the level for play purposes, it can be rather challenging to kill the boss viking but that's about all there is going on. Not recommended unless you want to learn from the modding technique it showcases.