Linkstar Free is a popular and addictive puzzle game that was released in 2017 by ZPLAY Games. The game is easily playable, requiring only your wisdom to link stars with the same color. The game features hundreds of puzzles ranging from easy to hard, with simple operation that allows you to play whenever you want.

The UI is clean and colorful, and the game offers two modes - Day and Night - to choose from, along with several color schemes. However, you need to be careful while linking the stars since the lines should not be crossed or overlapped.

Overall, Linkstar Free is a great puzzle game that will keep you engaged for hours with its challenging puzzles and easy-to-use interface.