Case Opening
How CS2 case opening actually works
Cs2 case opening reveals one item from a case's drop pool, weighted by rarity, then rolls a wear value and pattern. This guide breaks down the mechanics, the illustrative odds, and what actually determines the item you receive.
The mechanics, step by step
Choose a case
Each cs2 case has a fixed pool of skins across rarity tiers, plus a small chance at a special knife or glove.
The roll happens
Case opening selects one item weighted by rarity odds. Higher tiers are far less common than lower ones.
Wear is assigned
The item receives a float value, placing it in one of five wear bands from Factory New to Battle-Scarred.
Pattern is set
Some finishes also roll a pattern index that can raise or lower desirability.
Illustrative odds
Odds are weighted so common items appear far more often than rare ones. The figures below are simplified to explain the shape of the distribution.
| Tier | Colour | Illustrative chance |
|---|---|---|
| Mil-Spec | Blue | ~79.9% |
| Restricted | Purple | ~16.0% |
| Classified | Pink | ~3.2% |
| Covert | Red | ~0.64% |
| Special (knife/glove) | Gold | ~0.26% |
Simplified, illustrative odds for education only.
See case opening in action
Now that you know the mechanics, explore the case database or read our responsible play notes first.
Open CaseResponsible PlayFAQ
Frequently asked questions
How does case opening choose an item?
It selects one item from the case pool using rarity weighting, so common tiers appear far more often than rare ones.
Are the odds shown here official?
No. They are simplified, illustrative figures meant to explain how weighting works, not exact published numbers.
What is float in case opening?
Float is the wear value assigned to your item, placing it in one of five bands from Factory New to Battle-Scarred.
Is case opening gambling?
On external platforms it can involve real money and is for adults 18+. This site is informational only - see responsible play.
The psychology behind the roll
Case opening feels dramatic because the rare outcomes are so vivid, but the mathematics underneath is calm and heavily weighted toward common items. Knowing that the special-item slot sits at a fraction of a percent reframes the whole experience: the exciting drops are memorable precisely because they are unlikely. Understanding the sequence - rarity roll, then wear, then pattern - also helps you interpret any result you see, whether it is your own or a highlight clip. The healthiest way to approach the mechanic is as entertainment with a clear budget. Read the odds, enjoy the animation, and never treat a roll as an investment strategy.