Reward Probability

Crazy Frog Go Runner - by Funky Duke & Mach1 Recordings GmbH & Co KG

Last Updated: February 22, 2026

Overview

Crazy Frog Go Runner features a key collection system. During gameplay, players collect keys that appear in the running lanes. Collecting 3 keys completes a chest, which awards random rewards. Up to 3 chests can be earned per day. All chests and rewards are earned through gameplay only - no real money is required to open chests.

1. How Keys Are Earned

Keys spawn in the running lanes during gameplay. The chance for a key to appear depends on how many keys the player has already collected that day:

Key Spawn Rates

1st Chest (keys 1-3): 80% base chance per room
2nd Chest (keys 4-6): 50% base chance per room
3rd Chest (keys 7-9): 20% base chance per room
After all 3 chests earned: 0% (no more keys spawn that day)

Keys reset daily. Partial key progress (1 or 2 keys that did not complete a chest) is lost when a run ends.

Pity System

To prevent long streaks without finding a key, a pity system increases the spawn chance over time:

Each room where no key appears adds +5% to the spawn chance.
The pity bonus caps at +50%.
When a key successfully spawns, the pity bonus resets to 0%.
The pity bonus resets to 0% at the start of each new run.

Example: If a player is working on their 3rd chest (20% base) and 6 rooms pass without a key, the effective chance becomes 20% + (6 x 5%) = 50%.

2. Chest Types

The game features 3 daily chests. Each chest is assigned a vault type that determines its reward pool. The vault types are:

Wood Vault - Base tier rewards
Silver Vault - Mid tier rewards
Gold Vault - Top tier rewards

The specific vault assigned to each daily chest (1st, 2nd, 3rd) is configured by the game team and may change with updates. Each chest always gives exactly 3 different reward types - no duplicate reward types within the same chest.

3. Reward Types

When a chest is opened, 3 rewards are randomly selected from the chest's reward pool. The possible reward types are:

Coins - In-game soft currency used for upgrades and purchases
Diamonds - Premium currency
Credits - Secondary currency used for revives
Suit Parts (Skin Cards) - Collectible pieces used to unlock and upgrade character skins
Music Notes - Collectible music items

4. How Rewards Are Selected

Each vault has a reward pool with weighted probabilities. When a chest opens:

The system looks at all available reward types in the vault's pool.
A reward type is randomly selected based on its selection weight (higher weight = more likely).
A random amount is generated between the reward's minimum and maximum values.
The selected reward type is removed from the pool so it cannot be picked again for this chest.
Steps 1-4 repeat until all 3 rewards are generated.

Because each reward type can only appear once per chest, players are guaranteed to receive 3 different types of rewards each time.

Probability Calculation

The chance of receiving a specific reward type is calculated as:

Chance = (Reward's Weight) / (Total Weight of All Available Rewards)

Since rewards are selected without replacement (no duplicates), the probabilities adjust after each pick. The second and third rewards have higher individual chances because fewer options remain in the pool.

5. Suit Parts (Skin Cards) - Rarity System

When a "Suit Parts" reward is selected from a chest, the game must decide which character skin receives the cards. This is determined by a rarity-weighted system:

Skin Rarity Weights

Common skins: 40% weight
Rare skins: 30% weight
Epic skins: 20% weight
Legendary skins: 10% weight

How Skin Selection Works

The system filters out skins that are already fully upgraded (not eligible).
From the remaining eligible skins, one is randomly selected based on its rarity weight.
The awarded cards are applied to the selected skin.

Example: If there are 2 Common skins, 2 Rare skins, and 1 Epic skin eligible, the total weight is (2 x 0.4) + (2 x 0.3) + (1 x 0.2) = 1.6. Each Common skin has a 0.4/1.6 = 25% chance, each Rare skin has a 0.3/1.6 = 18.75% chance, and the Epic skin has a 0.2/1.6 = 12.5% chance.

6. Daily Rewards

In addition to chests, the game features a daily login reward system:

Rewards follow a 7-day cycle (Day 1 through Day 7).
Day 7 is the Grand Prize with a larger reward.
After Day 7, the cycle repeats from Day 1.
Players may optionally watch an advertisement to double their daily reward.

Daily rewards are fixed (not random) - each day gives a specific predetermined reward.

7. Milestone Rewards

Players earn milestone rewards as they progress through the puzzle system:

Milestones are reached at specific puzzle piece thresholds (e.g., 4, 8, 12, and 16 pieces).
Milestone rewards are fixed and predetermined - they are not random.
Possible milestone rewards include: Coins, Diamonds, Credits, Skin Cards, Chests, or World Unlocks.
The final milestone (16 pieces) unlocks a new world.

8. Mission Rewards

Completing in-game missions awards a fixed coin reward. Mission rewards are not random - each mission has a set coin amount configured by the game team.

9. Important Notes

All randomization uses Unity's built-in random number generator (UnityEngine.Random).
No real money is required to collect keys or open chests - they are earned entirely through gameplay.
All reward pool weights, amounts, and spawn rates are configured by the game team and may be adjusted in future updates.
Daily rewards, milestone rewards, and mission rewards are fixed (not random).

If you have questions about our reward system, contact us at Daniel@FunkyDuke.com.

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