Block Out: How to Clear Levels 215, 216, and 217

To clear Levels 215, 216, and 217 in Block Out, your immediate priority is creating and preserving at least one completely empty tube to use as a buffer. In these late-stage layouts, restricted slot space causes immediate board locks if you attempt quick matches without clearing top outlier colors or planning space for buried pieces.

Creating and Preserving Buffer Space

Levels 215 through 217 start with restricted tube configurations, making available move space your primary bottleneck. Operating without an empty slot limits your ability to reorder blocks, leading directly to deadlocks.

Establish an Empty Tube Early: Prioritize moves that fully clear a single tube before attempting long-term color sorting. An empty tube serves as a maneuvering area for temporary transfers.
Consolidate Dominant Colors: If all tubes are partially occupied, pick the color with the most immediate representation across top layers and group those pieces into one container to force an open slot.
Avoid Impulsive Matching: Shuffling single blocks to make quick matches often fills open slots prematurely. Hold off on a match unless it opens space or advances a stack to completion.

Managing Buried Colors and Isolating Stacks

The alternating color arrangements in levels 215 and 216 deliberately hide required blocks beneath single outlier pieces. Systematically removing top layers reveals buried colors without clogging secondary tubes.

Layer Isolation Sequence

Identify the top-most blocking color that prevents access to a lower stack.
Shift the blocking piece into a temporary open tube or onto a matching piece.
Consolidate the revealed target color into its designated destination stack.
Repeat from top to bottom, keeping stack heights lower across the board.

Calculating Move Requirements

Before deconstructing a cluttered container, tally the number of distinct colors inside it to verify you have enough structural room to finish the sort:

Container Contents	Required Buffer Space	Strategy
Single-color stack	0 empty tubes	Fill directly to clear the set.
Two alternating colors	1 available tube slot	Move the top color off to reach the lower color.
Three distinct colors	2 available tube slots	Pause deconstruction until secondary space opens.

Level 217 specifically punishes sorting bottom colors prematurely. If a tube holds three distinct colors and you lack two available spaces to hold the top layers, work on a different container until space opens up.

Strict Placement Rules to Avoid Deadlocks

A deadlock occurs when every tube contains mixed colors and no open slots remain. Adhere to two strict rules during late-stage moves:

Matching Placement Only: Only place a block into a tube that already contains the exact same color at the top, or into a tube that is entirely empty. Never drop an unmatching piece onto a different color.
High-Entropy Recovery: If multiple tubes become mixed, stop all secondary sorting. Find the single most accessible color, combine all visible pieces of that color into one place, and restore board clarity before resuming deeper clears.