See HiScores for the relative total rankings of the different skills.

Skill mastery is achieved by reaching level 99 in any skill. Level 99 is achieved by reaching 13,034,431 experience points in a skill with the exception being Invention (36,073,511 experience to reach skill mastery). Level 99 is the maximum level in most skills. Dungeoneering, Invention, and Slayer are the only skills with a maximum level of 120 (referred to as true skill mastery), achieved at 104,273,167 experience points for Dungeoneering and 80,618,654 for Invention. The current maximum total level is 2,736 (level 99 in all skills and level 120 in Dungeoneering, Invention, and Slayer). When level 99 is reached in any skill, there is a different fireworks animation that can be heard by everyone nearby.

Pay-to-play players reaching level 99 in a skill are entitled to wear a Cape of Accomplishment for that particular skill. This cape is bought from a specific skill master for 99,000 coins. Every Cape of Accomplishment gives access to a unique emote. Furthermore, it can be used to boost the corresponding skill's level to 100 for a short time. Every Cape of Accomplishment has its own unique perk, some of them can be activated by right-clicking on the cape, others are passive. If the player reaches level 99 in more than one skill, the player's skill cape becomes trimmed and any more skill capes the player obtains will also become trimmed along with the newly received cape.

Before the Skill interface update, players with a level 99 skill could view the experience needed to earn level 100. With the virtual levels update, players could once again view the experience needed, all the way to level 120.

In RuneScape Classic, the maximum total level was 1,782. With the addition of Runecrafting (1,881), Slayer (1,980), Farming (2,079), Construction (2,178), Hunter (2,277), Summoning (2,376), Dungeoneering (2,496), Divination (2,595), Invention (2,715), and the increase of Slayer from level 99 to 120, the maximum total level is now 2,736.

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Announcements

When a player achieves level 99 in a skill, a message will appear in orange text to the other players on the same server. However, one may only see another player's achievements if they have the 'Broadcast Messages' button toggled to on, located next to the trade and assist button. Broadcasts may be disabled by untoggling the 'Broadcast Messages' button.

Achieving level 120 in Dungeoneering, Invention, or Slayer, reaching 99 in every skill, or earning the right to wear the Completionist cape or its trimmed version will be announced on all of RuneScape's servers in red text. Being the first to achievement a milestone on either a regular, ironman or hardcore ironman account also grants a global broadcast: Congratulations to Player for being the first to reach level skill!

When a player achieves a 99 and their private chat is set at least on 'friends', it will be announced in green text to all logged-in players on their friends list regardless of whether they are on the server.

Level 99 Jingle Sound acquired at any level 99 skill

First players to achieve level 99

When level 99 skills first started appearing, players with such stats were often well known around the RuneScape community since they were one of the few to have achieved a skill mastery.

Below is a chronological list of the known first players to reach level 99 and level 120 in their respective skill.

^ Dragoon 787 and Cowchicken both reached level 99 Firemaking on the same day, however there is debate between who reached it first due to lack of concrete evidence. ^ a b c Attack, Strength and Defence did not appear on the hiscores until 2004, making it very difficult to track who achieved 99 in these skills.

Ironmen and Hardcore Ironmen

First players to reach maximum skill totals

Notes

^ These numbers only include players who are listed on the hiscores. ^ These numbers only include ironmen players who are listed on the hiscores.

Trivia

Players sometimes hold parties with their friends to celebrate their achievements in mastering a skill, usually at their player-owned house. This was extremely common prior to 2013, where mastering a skill was a rarer achievement for someone to have.