Keel: Heavy Seas

The high-difficulty cargo-balance challenge. The rules are the same, drop containers, clear lines, keep the hold level, but the ship reacts far more sharply to imbalance. The list builds quickly and the recovery window is short, so precision matters on every single piece.

• Load and rotate falling cargo to clear rows
• Manage a ship that heels faster and steeper than usual
• Correct any lean immediately before it runs away
• Survive the heavier physics as long as you can

• Desktop: Left/Right arrows move, Up rotates, Down soft-drops, Space hard-drops
• Phone & tablet: swipe to move, tap to rotate, swipe down to drop

• Stay near level at all times, there's little room to recover here
• Pre-plan each drop so you're never forced into a heavy side
• Prioritise clears that lower weight evenly across the hold

The Keel cargo-balance game with the tolerances tightened — the ship lists faster and further, so a single careless container can roll you.

Difficulty here is not more pieces or less time but less forgiveness. The same board that is comfortable in Open Water becomes unstable because the margin between a slight heel and a capsize has narrowed.

That is an unusual difficulty knob. Most arcade games get harder by speeding up; this one gets harder by making your existing mistakes matter more, which punishes sloppiness rather than slowness.

Further reading: Half Again as Much Sea

Keel: Heavy Seas is the original hard-mode entry in the Keel series, fusing falling-block puzzling with a punishing balance mechanic, a free browser game for veterans.

A free, original browser game on PlayPendium. No download, no install.

1. Half Again as Much Sea

   The rule is one multiplication. What it changes is the amount of time you have to notice you were wrong.