STACKING LABBLOCK STACKING TRAINER
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STACKING LAB · PRACTICE GUIDE

4-Wide combo practice

In this 4-Wide exercise, you build across the six left columns and keep a four-column channel on the right. The challenge is to prepare a useful stack, then clear consecutive pieces through that channel without breaking the combo.

Build, then clear

The coach has separate building and combo phases. During building, it favours safe placements in the left wall and preserves the right channel. The height guide marks the build target; a dangerous or uneven field can make an earlier clear necessary.

During the combo phase, each piece needs a line-clearing placement to extend the sequence. A placement that clears no lines ends an active combo. A little material at the bottom of the channel can be useful; a tall, blocked channel makes continuation harder.

A repeatable combo drill

  1. Build a usable wall. Look for covered holes in the six left columns. A high wall is not useful if it hides problems you cannot clear.
  2. Inspect the next few pieces before descending. Ask how the channel will change after the first clear, not just whether the current piece clears a line.
  3. Follow the changing surface. Compare your intended placement with the coach and try to identify a continuation for the next visible piece.
  4. Study a break. Use move history or undo to examine the placements before a combo ended. The earlier choice may have removed the space needed by the final piece.

Reading the counters

The combo display describes the current sequence. Best tracks the best combo recorded in the session, while Breaks counts combos that break during the combo phase. Use these as feedback on consistency rather than as a reason to stack recklessly high.

This mode is specifically the right-side 4-Wide layout. Its independent coach is designed for that practice goal and does not try to reproduce every competitive situation or opponent interaction.

Questions

Why does the coach clear before reaching the line?

The line is a build target. Safety and the shape of the stack also matter: recovering from a dangerous field can take priority over reaching that height.

Why not use only the current piece?

A clear can leave a shape the next piece cannot use. Planning a short continuation helps you keep a combo alive. For more practice reading a route through existing blocks, try downstacking.

Try it on the board

Free, ad-free and playable in your browser. No account required. A keyboard is recommended.

Start 4-wide combo practice