Block Out Level 870 Strategy: Tube Management and Sorting

To beat Level 870 in Block Out, clear top-layer block clusters immediately while preserving at least two completely empty tubes as flexible workspace. This prevents mixed-color bottlenecks at the top of narrow columns and allows you to shift individual blocks without trapping lower layers.

Key Execution Rules

Maintain sorting flexibility and prevent game-ending board locks by following these primary strategies:

• Reserve Buffer Space: Keep two empty tubes unsealed whenever possible. Use these open slots exclusively for holding temporary single-color blocks while clearing blocked columns.
• Clear Top Layers First: Match accessible topmost blocks before shifting deeper elements. Removing top segments exposes lower colors needed to build full sets.
• Assign Single-Color Destinations: Select specific columns for dedicated colors early in the attempt. Avoid moving blocks into columns that have a different base color.
• Finish Near-Complete Stacks: Prioritize finishing the stack closest to completion. Completing a full color set removes it from the board, immediately freeing a new buffer tube.

Managing Deep Stacks and Bottlenecks

When dealing with columns containing multiple stacked colors, apply this systematic sequence to avoid locking key pieces:

1. Scan Base Colors: Check the bottom color of a column before placing any block on top of it. Never add blocks to a column containing two different colors unless you can remove the upper layers immediately.
2. Target High-Frequency Colors: Identify which colors appear most frequently across the board and focus on grouping those first.
3. Execute Cascades: Look for move sequences where completing one set automatically opens access to clear another locked stack.
4. Free Trapped Slots: If all buffer tubes become occupied, execute the most direct available color match to free a tube and regain board mobility.