Plain gravity is the main mechanic that matters here. It feels like a lazy way to play but it works.
Click groups of same-colored blocks, and the UFO drops down.
You use mouse clicks or touch taps to select blocks. There are over forty levels to beat, and you must clear star blocks to win.
Most players should aim for the biggest groups of blocks first. Focus on star blocks because they are tougher.
Q: What are the controls? A: Mouse clicks or touch taps are used.
Q: What is the objective? A: Clear a path so the UFO moves home.
Q: What features are stated? A: Over forty levels and star blocks are stated.
Q: What is the main mechanic? A: Collapse blocks to clear a path.
Click groups of same-colored blocks to make the UFO drop, using plain gravity which feels lazy but works, I think it is chill. Halloween Block Collapse Delux requires clearing star blocks and clicking groups to win levels, so focus on big groups for an easy path.