Sand Blocks level guide
Sand Blocks: Drop Puzzle Level 21 Walkthrough
Level 21 opens its double 4-count gate with blue, red-arrow, red-square, and second-blue clears. Route the yellow/blue/green receivers released at zero, then use the untouched large green and yellow squares on the top reservoir.
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How to Solve Sand Blocks Level 21 — Full Solution
- Raise the central green 2x2 one row to open the shaft; leave it at 0%.
- Move the upper blue 2x2 from the right stack into the shaft under the left blue chamber; hold through 67% to 100%, and verify the gate changes 4→3 when it disappears.
- Slide the red arrow 1x2 from upper-left to the right red outlet; its 100% removal changes every gate piece 3→2.
- Move the lower-left red 2x2 through the center beneath the right red mound; wait for its clear and the 2→1 change.
- Lift the lower-right blue 2x2 to the left blue outlet; its last blue fill removes it and changes the gate 1→0.
- Wait for the zero-count rows to become a yellow arrow plus two yellow squares, a center blue bar, and two green squares plus a green bar.
- Park the surviving yellow 2x2 at bottom-left and the surviving green 2x2 at bottom-right.
- Pull the released blue 1x2 down from the middle row so the small receivers can cross the center.
- Clear the inner yellow 1x1 under the center-left edge, then clear the outer yellow 1x1 in the cell it opens.
- Slide the yellow arrow 1x2 along the upper-left outlet until its horizontal footprint reaches 100% and disappears.
- Clear the inner green 1x1 under the center-right edge, then clear the outer green 1x1 at the right outlet.
- Shift the green 1x2 bar left beneath the green fall line and wait for its 100% removal.
- Raise the original green 2x2 from bottom-right to the upper-left bank and hold until it pauses at 99%.
- Let the released blue 1x2 take the last left-chamber blue residue and disappear at 100%.
- Move the original yellow 2x2 beneath the upper-center/right mound; after yellow clears, wait for the last green grain to complete the parked green square and trigger confetti.
Colors in this level:
Green, Yellow, Cyan, Blue, Red
Common Mistakes to Avoid
- Reusing the first blue or either red receiver in prose after its 100% clear has removed it.
- Moving the original green or yellow 2x2 into a countdown role and losing the final bank receiver.
- Leaving the released blue bar across the middle while the yellow and green 1x1 squares need to cross.
Quick Tips for Sand Blocks Level 21 (quick clues)
- Checkpoint the gate after each clear: blue makes 3, red arrow 2, red square 1, and second blue zero.
- Do not count the center green or bottom yellow square as a gate clear; both survive for the final reservoir.
- Clear the released 1x1 pieces before their longer yellow and green bars.
Board notes 5 details
- Layout
- A six-column board has green sand over the left half and yellow over the right, with two staggered cyan rows marked 4. Below are left blue and right red chambers, a central green 2x2, a red arrow 1x2 over a red 2x2 at lower-left, a yellow 2x2 at bottom-center, and two blue 2x2 squares stacked on the right.
- Goal
- Use four distinct lower receivers to trigger 4→3→2→1→0, clear the yellow/blue/green receiver row revealed at zero, and preserve the original green and yellow 2x2 squares for the broad top banks.
- Opening
- Raise the center green square one row, move the upper-right blue square into the shaft under the left blue wedge, and wait for that receiver to disappear before sliding the red arrow bar to the right outlet.
- Danger Zone
- Every 100% receiver disappears. The first blue, red arrow, red square, and second blue cannot be reused after their countdown clears, while the original green and yellow squares must remain available for the finish.
- Mechanics
- All cyan pieces decrement together. At zero they transform into a yellow arrow, two yellow squares, a blue bar, two green squares, and a green bar; those released receivers have separate one-clear lifecycles.
Frequently Asked Questions
Which receivers take the gate from 4 to zero?
The upper blue 2x2 makes 3, the red arrow makes 2, the red 2x2 makes 1, and the lower blue 2x2 makes zero.
What appears after the gate reaches zero?
Three yellow receivers, one blue bar, and three green receivers replace the cyan rows.
Which receivers must survive for the top reservoir?
Keep the original center green 2x2 and bottom yellow 2x2; green clears the left bank before yellow clears the right bank.