
Certer is a random event.[1] Certers Miles, Niles, or Giles teleport a player to their office and present them with a rotating image of an item, and three possible choices of what it is. If a player correctly identifies the item, they will receive a Random event gift and are free to use the exit portal. An incorrect choice will result in the player's equipment and inventory being noted and the player being teleported to a random location.
Their new office includes a working Deposit box. You cannot access all your controls whilst in this office. For instance, you cannot use Prayer, but if you had prayers active before you were teleported here, you would be teleported back with the prayer still active but not having been drained.

In Postbag from the Hedge 35 (released 30 October 2008) Giles says:
| “ | We are most hopeful that this little piece of bureaucracy will soon be a thing of the past, and we can all go on a well-deserved holiday, or possibly even retire. | ” |
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— Giles, [2]
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Before the Random event rework, one of the Certers appeared next to the player. The question window opened when talking to the certer. If ignored, he gave the player four warnings. If the player yet ignored him, he teleported the player to a random, relatively safe place and turned his inventory and equipment into bank notes. Some players considered this very annoying during combat.

| Current |
Bee-keeper • Cap'n Arnav's Chest • Certer • Drill Demon • Evil Bob • Evil Twin • Freaky Forester • Kiss the frog • Gravedigger • Lost and Found • Maze • Mime • Pillory • Pinball • Prison Pete • Quiz Master • Sandwich lady • Surprise Exam |
| Discontinued |
Big fish • Candlelight • Dr. Ford • Drunken Dwarf • Ent • Evil Chicken • Exploding rock • Jekyll and Hyde • Lost Pirate • Poison Gas • Rick Turpentine • Rock Golem • Security Guard • Shade • Strange plant • Swarm • Tangle Vine • Tree spirit • Watchman • Whirlpool • Zombie |
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