### 1. **Storyline for Week KS**

- **Plot**: The player finds themselves in the Slap Battle arena, facing off against various opponents representing different Killstreak levels. As the week progresses, the intensity of each opponent increases, symbolizing the climb from Killstreak 4 to Killstreak 1000.

- **Dialogue**: Each Killstreak opponent has unique dialogue before and after each battle, taunting the player or commenting on the "slap" history behind their rank. Higher Killstreak opponents could even have cryptic lines hinting at the difficulty and the power of the next level.

### 2. **Killstreak Characters and Visuals**

- **Killstreak 4**: A beginner-type opponent, with fewer visual effects and simpler attacks. Their moves are rhythmic but slow, giving players an easy start.

- **Killstreak 250**: This character is more confident, with edgy visuals like pulsing red and black effects. They use trickier rhythms, adding a moderate challenge.

- **Killstreak 1000**: The ultimate boss character—intense visual effects, like flames or glitching graphics. Their rhythm is erratic, with challenging patterns and special effects like screen shakes or "dizzy" effects to up the difficulty.

### 3. **Custom Mechanics**

- **Slap Meter**: A mechanic where players fill a meter with successful hits. When full, it allows a temporary "power-up" where the player gains extra points or deals extra "slap damage" to the opponent.

- **Killstreak Power-Ups**: Each Killstreak opponent could have a unique power-up activated at certain points, like speed boosts, health recovery, or rhythm change-ups, that add complexity.

### 4. **Music and Sound Design**

- **Unique Tracks**: Each Killstreak opponent could have a custom track that represents their level and style. For instance, Killstreak 4 has a lighthearted, simpler beat, while Killstreak 1000 has a fast, intense track with heavy bass and distortion effects.

- **Sound Effects**: Add slap sound effects when hitting notes to give it that extra slap-battle feel.