1. Spikes
Spikes are one of the most prevalent and hazardous obstacles in this game. They appear in various forms, such as static spikes, moving spikes, or spinning spikes. They require precise timing and careful navigation to avoid, as touching them will result in an instant failure.

2. Sawblades
Sawblades are another perilous obstacle commonly found in Geometry Dash Scratch levels. They consist of rotating blades that can be positioned horizontally, vertically, or diagonally. Players must carefully maneuver through narrow gaps between the blades or time their movements accurately to avoid getting sliced and failing the level.

3. Moving Platforms
Moving platforms introduce a dynamic challenge in Geometry Dash Scratch. These platforms can move vertically, horizontally, or follow complex patterns. Players need to time their jumps and movements accurately to land safely on moving platforms without falling into gaps or colliding with other obstacles.

4. Gravity Switches
Gravity switches alter the direction of gravity, defying conventional physics and adding a layer of complexity to the gameplay. These switches can suddenly invert gravity, causing players to fall upwards or sideways. Adjusting to the changing gravity and adapting movement accordingly can be challenging and lead to unexpected deaths if not anticipated.

5. Pulsating Objects
Some levels feature pulsating objects that expand or contract rhythmically. These obstacles require precise timing and coordination to pass through safely. Misjudging the timing can result in collision and failure.

6. Fast-Paced Sections
Levels often incorporate fast-paced sections that demand quick reflexes and rapid decision-making. These sections may involve a combination of obstacles, requiring players to react swiftly to avoid spikes, sawblades, or other hazards that come their way.

7. Wave Segments
Wave segments introduce a different gameplay mechanic, transforming the character into a wave-like form. Maneuvering through wave segments can be challenging due to the need for precise adjustments to avoid obstacles and navigate through tight spaces.

8. Impossible-to-Pass Sections
Some levels include intentionally designed impossible-to-pass sections that require players to employ creative solutions or exploit game mechanics to progress. These sections are meant to test players' determination and problem-solving skills.

It's important to note that the difficulty and dangerousness of obstacles can vary greatly depending on the level and the player's skill level. What may be challenging for one player could be relatively easier for another. Additionally, the Geometry Dash Scratch community continually creates new levels with unique and innovative obstacles, expanding the range of challenges available. Remember, the fun in Geometry Dash Scratch lies in overcoming these obstacles and gradually improving your skills through practice and perseverance.