To control the fire sibling, simply use the arrow keys or WASD to move them around the level. They have the ability to create fire obstacles which can be used to destroy certain enemies or break barriers.

Yes, you can switch between the fire and water siblings by pressing the spacebar. This allows you to utilize their unique abilities to overcome different challenges.

Collecting the red and blue keys is necessary to unlock doors in later stages of the game. Each key corresponds to one of the siblings' elements, and they are required to proceed.

Gold can be collected by moving your character over it. It is scattered throughout the levels and can be found near obstacles or hidden in secret areas.

Yes, there are power-ups available that can enhance your characters' abilities temporarily. These can be found within the levels and provide benefits such as increased speed or additional health.

If you fail to complete a level, you will need to restart from the beginning of that particular stage. Make sure to use the hints and strategies provided to overcome any obstacles.

Unfortunately, there is no built-in save feature in this version of the game. You will need to complete each level in one sitting to ensure you don't lose your progress.

The difficulty increases by introducing more complex puzzles and faster enemies. Later levels also require more strategic use of both the fire and water siblings' abilities.