Exploitable Glitches
 Artifact Collection
You were not meant to have more than one artifact at any one time; if you're holding one, you simply cannot get another artifact quest. There's an exploit that allows you to get another artifact, though: if it's an artifact that can be repaired, use it once, bring it to a store, and put it in for repair. At that point, because you do not have an artifact in your possession, you can get another artifact quest. Unfortunately, this does not work for players who have chosen the Knight class as their weapons and armor are automatically repaired.
 Cheap Repairing
Set the amount of gold to 1 GP when attempting to have an item repaired. The game will display a prompt with a large waiting time. Ignore this and click on the item's status. Doing so will modify the wait time to less than 50 days, generally around 20. Alternatively, for artifacts, set the amount of gold to 13. The game will also display a prompt with a large waiting time. Ignore this and click on the item's status. Doing so will modify the wait time to less than 1 day, generally around 15 hours. Testing shows that this rule still works under version 1.06
 Duplicating Weapons and Armor
A further exploit of ineffective data clearing.
Give any piece of armor or any weapon to a storekeeper for repair. When the waiting time is up and your item is ready to be reclaimed, click it in the job status list to retrieve it. At that point, quit the conversation window, talk to the storekeeper again, and you can once more check the job status and receive a duplicate version of the item. This may be continued indefinitely, and even works after exiting the store.
 Free Rooms at Inns
As a result of data not being cleared, it is possible to sleep for free at any inn.
First, save your game outside the inn you wish to stay in. Enter the inn and purchase a room. Now reload the saved game and enter the inn. Click on the camp button. Despite the fact that you did not purchase a room in the saved game, the occupied rooms data will not clear, allowing you to sleep within the inn.
- Note that this glitch does not always occur.
 Increased Treasure Piles
Another data clearing exploit.
Enter a dungeon and find a stairwell going down. Move down the stairs, then turn and go back up. Each repetition of moving up and down the stairs will increase the amount of items in the treasure piles.
 Increase Spell Points
When an offensive spell-casting item is used, and gives the option to pick the target, instead of left clicking, right click your mouse. It will cancel the spell, adding the points to your spell points, instead. The number depends on which spell you last cast - the more points it cost, the more points you'll get. This can be used to increase your spell points far beyond your limit.
- Note that this can cause the game to crash if used too many times immediately in a row (usually more than 80). Points can also simply vanish later for an unidentified cause.
 Create Dungeon Spell
You can create a dungeon anywhere in the world outside of buildings by destroying a floor tile and creating a wall over it. It will be a door on all sides that leads to a dungeon in which the interior is based on other buildings in the area, including houses.
These typically have a low monster rate, but have at least one pile of treasure lying around. Which goes well with the increased treasure pile glitch.
 Free Plate Cuirass
When buying armor, double click on the small space between the last buyable item and the lower border of the item list. You will be offered a plate cuirass for 0gp. You can sell that cuirass for only 1gp but it has the same efficiency.
 Problematic Glitches
 Item Checked In for Repair Is Gone
Sometimes you will check an item in for repair, and later when you go back for it, it's not there any more. The reason for this is that the size of the file where Arena stores locations is limited to 131136 bytes. The number of cities and dungeons the game can store in this file depends on their size. Large dungeons with many levels consume the most space while small cities take the least space. The total number of places the file can store is somewhere between eight and sixteen — when you discover more, the game deletes the oldest entries. In any case, if you go to too many places between the time you start the repair and the time you come to pick up the repaired item, you run the risk of the game forgetting that you put the item in for repair.
 Quest Success Unrecognized
Sometimes when you return from a quest with a quest item, the quest giver does not recognize that you have the item. For instance, if you got the quest from a temple priest, when you talk to him you might just get the standard talking-to-a-priest menu. When this happens, leave the building and save the game. Completely exit Arena. Restart Arena and load the saved game. The quest giver should now recognize that you are holding the item.
 Garbled Quest Location
When asking townspeople about the location of the next dungeon, the location they specify may have missing or garbled characters. If so, you will not be able to continue the main quest until the bug is corrected. To do so, simply save your progress and restart the game, just like with the Quest Success Unrecognized glitch.
 Stuck on a Raised Platform
Arena has problems with the math when you step down from a raised area. Sometimes you get stuck and cannot move in any direction. You will be able to turn 360°, though, and that is a saving grace. Place yourself so that you are moving directly toward or directly away from the riser (directly = not at an angle), then jump forward (press Shift-J). That should get you going again. As always, be careful what you jump into.
 Unarmed Melee Combat
In theory, you can use your fists to do damage in melee combat or to break down a door. In practice, this nearly always crashes Arena, even if you have the correct amount of EMS allocated under (genuine) DOS. The workaround for this is to always use a weapon. If you don't want to wear out your main weapon for some reason (e.g., just to bang down a door), use a weapon you got from a monster. Those are usually pretty worthless to carry and sell but can be temporarily used just to break down doors.
 Faulty magic items
Upon equipping a Bracelet of Strength, it will initially give one +10 points of Strength; however, the Strength value will inexplicably drop back to its original value, and if you remove the bracelet, you will LOSE 10 additional points of Strength. Buying another Bracelet of Strength won't solve the problem, you have still permanently lost the 10 points and are basically stuck with a faulty bracelet for the rest of the game. Occurred on High Elf Battlemage. Leveling apparently solves the problem.[verification needed — see]
This glitch seems to occur most often when using a custom spell involving "transfer X attribute to caster"; it may be assumed that if the target's attribute is lower than the caster's, the spell will inflict a drop in the caster's attribute. Thus, such spells are better avoided, and the values do reset upon leveling. Another issue is when a human enemy such as a Mage or Spellsword casts a Curse upon you, lowering one or more attributes, one of those attributes may stay permanently lowered until level-up.
 Last Vision Lost
After you pick up the last Staff piece in Dagoth-Ur, you're supposed to get a vision from Ria Silmane where she tells you to go to the Imperial Palace to pick up the Jewel of Life. In fact, you won't get this vision. It is not clear why this is, mostly because there are no conditions under which you get the vision.