Completion Meter

100% will net you Fanservice.

A feature common in video games that focus on collecting stuff and/or earning achievements, letting the player know how many pieces of hidden content (collectables, unlockables, etc.) the game has in total, how many the player has already found, and, by simple math, how many are still out there.

Those are often found in the game's pause menu or file select screen, and will show up in the ending as one of the factors used to grade your overall performance. 100% Completion usually leads to a reward, but that may not be the case if other determinants like clear time or use of continues influence the end result as well.

Often, separate counters are provided for different types of hidden content in different levels/locations to further assist the player in finding that Last Lousy Point.

Sub-Trope of Status Line (a display element showing the current disposition of the player, e.g. score, health, ammo, etc).

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Examples:

Action Adventure

• Brütal Legend keeps a large number of counters in the main menu, from how many collectibles Eddie has found, to how many unit combos he tried out, etc.
• The Legend of Zelda: Breath of the Wild has one, but it actually doesn't take into account a myriad of the things in the game, such as sidequests. Instead, it measures how much exploration of the world map you did by noting if you found and completed every shrine and dungeon, collected all 900 Korok seeds, and visited every location.
• Most Metroid games have a percent counter that rises as you collect items.
• Castlevania: Symphony of the Night features one that keeps track of the number of rooms you have visited, rather than item completion, and it can go as high as 100.3%. But if you defeat Richter the right way and unlock the Inverted Castle, you can get as high as 200.6% normally (utilizing glitches to explore spaces outside the usual boundaries can get you as high as 215%), though you get the best ending by having higher than 195% and defeating Dracula in the Inverted Castle.
• The pause screen of An Untitled Story keeps track of how many bosses you've defeated and how many upgrades, hearts and gold orbs you've collected, and summarises them into a percentage of completion.
• Just before the Final Boss of Hollow Knight, you get an ability to see your progress percentage, which also becomes visible in the savefile menu.

Adventure Game

• Scott Adams' adventure games (Adventureland, Pirate Adventure, etc.) had a counter with your current score and the total number of points available (e.g. 5/20). Your score was based on how many items of treasure you had found.
• Ditto in the earlier Leisure Suit Larry games.
• Parodied in Freddy Pharkas: Frontier Pharmacist: You can collect 1,000 points. You get the first 500 at the very beginning by unlocking the pharmacy.
• In Strong Bad's Cool Game for Attractive People, Strong Bad's "Awesomeness Meter" serves as one of these for each episode, increasing as the player completes side-quests and collections.

Eastern RPG

• EXTRAPOWER: Attack of Darkforce: The completion meter is measured as Progress when checked between episodes, but correlates to your Hero Score. Your Hero Score and ranking is given at the end of the game and progresses when you perform especially heroic or character specific actions in combat, as described in a text document included in the game files. Playing without consulting the document can still give a respectable middling Hero Rank, but the true final boss and true end are tied to completion.
• Final Fantasy XIII-2 shows a rundown of memory fragments by type and by location, as well as the overall count. Moreover, Historia Crux shows how many Time Gates are available in each location and how many have already been opened; and the map screen shows how much of the current location you have visited.
• Xenoblade Chronicles 1 shows the percentage completion of each Collectopaedia.
• The save file menu of Dubloon shows the percentage of chests you've opened on a given save file.
• Achievements in Genshin Impact that are determined by completing a certain number of tasks will have these listed alongside its description. Each achievement category will also have a running percentage underneath its name to show much of said category you've completed. Also each section of the world map shows a percentage based on Inexplicable Treasure Chests opened, puzzles solved, collectibles collected etc.
• In the Steven Universe RPGs (Attack the Light, Save the Light, and Unleash the Light), each stage tells you how many items and secrets you've found whenever you step on the Warp Pad.

Massively Multiplayer Online Role Playing Game

• The map screen in Guild Wars 2 shows a World Completion meter tracking how much of the map you've explored and completed content in and a lesser completion meter for the individual area you're currently in, alongside the number of each type of objective in both.

Platform Game

• Donkey Kong Country keeps track of bonus rooms and K-O-N-G letters the player finds in each level. The Game Boy Advance remake also has a virtual scrapbook for special pictures found in-game.
• Crash Bandicoot: the first game only has "Great! But you missed X crates" when you don't manage to crash all crates in a level, which gives you a gem; you need all gems to reach the secret second ending. The second game gets better at this, showing how many crystals/gems you need to get in each level, amount of crates you've broken, and how many they are in each level (the latter only at the end of levels), and you can also see your completion percentage by pausing the game/going to the load/save screen. The third game and all of N. Sane Trilogy also show the amount of crates in a level anywhere (not just in the end) by pressing Triangle.
• Curse Crackers: For Whom The Belle Toils: Each save file in the menu shows a percentage of how complete each save file is depending on how many Ardel Roses, Lore Books, Oath Blades, Lost Souls, and Medals you have acquired, as well as how many levels you've completed. It also shows additional images if you've completed the main post-game quest, or the Ticket quest, both of which don't count towards regular completion.

Puzzle Platformer

• Antichamber: The room you start in acts as an overworld map, a settings page, a place to track all the quotes you've found so far, and the place you can escape to anytime when stuck.

Puzzle Game

• Patrick's Parabox: A counter shows how many puzzles you have solved, comparing it to the total number of puzzles in the game once you see the end credits.

Stealth Based Game

• A staple in the Assassin's Creed for "additional memories", such as collectible flags in the first installment, and eagle feathers in the second.
• Alpha Protocol tracks how complete your dossier files are.

Western RPG

• Ubiquitous and justified in Dragon Age: Inquisition: for most Collection Sidequests (of which there are a lot), you know exactly how many pieces of whatever you're supposed to collect there are on the current location and often even where they are exactly. The reason for this becomes obvious if you pay attention to the surroundings: almost every location of any interest is haunted by Leliana's pet ravens. In other words, you know what and where to look for because your diligent Spymaster already found and cataloged it for you.

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