Penguin Level, or simply level, is a measurement of progress used in Club Penguin Island. All players start at level 0 and can increase their level by gaining rank, which is received in the form of XP (experience). The player's level is the sum of their rank for each quest-giving character. For instance, if a player's Aunt Arctic and Rockhopper ranks are 3 each, and Rookie and Cadence ranks are 2 each, the penguin's level is 10 (3 + 3 + 2 + 2).
The character the daily challenge is associated with or adventure is given by determines which color of XP the player receives. For instance, completing the adventure "Leaky Landing", given by Aunt Arctic, yields green XP, as does the Daily Challenge "Good Altitude", which is labeled with Aunt Arctic's face. The majority of Daily Challenges yield 40 XP each, although some community challenges do not award any, while all but one adventure yield 60 XP each. Additionally, adventures only yield XP the first time they are played, and replaying will not yield XP again.
Aunt Arctic XP, Rockhopper XP, Rookie, and Cadence XP are each received from completing adventures and daily challenges received from said characters. Currently, the highest possible rank for Aunt Arctic and Rockhopper are each 9, while for Rookie, it is 6, and for Cadence, it is 3.
XP gain is mostly exponential, and as such, higher ranks require greater or equal amounts of XP than previous ranks. Effectively, 5365 XP total is required to reach the current maximum level of 27.
XP required from previous rank
Ranks 7, 8, and 9 do not apply to Rookie as he currently only has 6 ranks, and 4 and above do not apply to Cadence as she only has 3.
Adventure rank requirements
Adventures require the player has a certain rank or higher in order to play. All adventures yield 60 XP, with the exception of Leaky Landing: fixing leaks on the Migrator yields 10 Rockhopper XP, opening the Starter Kit yields 15 Aunt Arctic XP, and completing the adventure itself yields 50 more Aunt Arctic XP.
1.0.0: The initial 12 levels and packs are available. Aunt Arctic and Rockhopper each have a max of 6 rank.
1.0.1: The XP required to reach Rockhopper rank 1 is changed from 75 to 20 XP. The "available in shops" rewards now show the cost of party supplies, overlaid in the corner of the supplies' icons. Unlocked adventures are now shown in level packs, although they are unlocked by reaching a specific rank, and are independent of levels.
1.1.1: The XP required to reach Rockhopper rank 1 is changed back to 75.
1.2.0: Three new levels are added (13- Prehistoric, 14- Punk, and 15- Town Heroes) and Aunt Arctic rank is increased to 9. Tubes are added as rewards. Some blueprints were added to previously existing packs: the Palm Leaf Wraps were added to the Wild Pack (level 4), the Fluffy Charm, The Two Tails, and The Club Cut were added to the Sharing Pack (level 5), and the Rugged-alls, The Hookback, and The Wavy Doo were added to the Party Pack (level 10). The Smoothie Tray was also added to the Sharing Pack.
1.3.0: Three new levels are added (16- Extreme, 17- Urban Style, and 18- Fantasy) and Rookie rank is introduced, with 3 rank. Blue Pompoms and Red Pompoms are added as gear for the Sports Pack (level 6).
1.4.0: Three new levels are added (19- Formal Dance, 20- Stage, and 21- Forest) and Rockhopper rank is increased to 9.
1.5.0: Marble Hunt and Ink or Swim are added to the Citizen Pack (level 1).
1.6.0: Three new levels are added (22- Power-up, 23- Sun, and 24- Food) and Rookie rank is increased to 6. Fossil Four is added to the Citizen Pack.
1.7.1: Stinky Cheese is removed from "available in shops" in the Citizen Pack, and is instead available by default. Spruce Guitar, Spotlight Mic, and Percussion Set are added as gear for the Stage Pack (level 20).
November 1, 2017: The XP required to increase in Aunt Arctic and Rockhopper rank has been lowered from its original amounts (75, 280, 610, 1010, 1500, 2080, 2700, 3320, 3940) to 60, 190, 390, 610, 830, 1065, 1315, 1580, 1860. Rookie rank has also been lowered from its original amounts (190, 440, 810, 1250, 1780, 2360), currently requiring the same amounts as Aunt Arctic and Rockhopper's first 6 ranks.
1.8.0: Several new reward types were added: furniture and buildings available for purchase, igloo lighting, music, and locations, and extra igloo slots.
1.9.0: Two new levels are added (25- Wilderness and 26- School) and Cadence rank is introduced, with 2 rank.
1.10.0: One new level is added (27- Western) and Cadence rank is increased to 3.
1.10.2: Cake Slice, Seaweed Smoothie, and Fireworks are removed from "available in shops" in the Citizen Pack, and are instead available by default. Nine new furniture available for purchase are added to Fame Pack (level 3).
There are two packs named "Fantasy", the first is received by reaching level 7, and the second is received by reaching level 18. However, the set names for the fabrics and decals from the first Fantasy Pack, when viewed in the Clothing Customizer, are "Medieval". The theme selection option at Igloos & Interiors also refers to the first as "Medieval".