Block Out Level 423 Walkthrough
AdvancedMeasured from the Level 423 image on this page, the sampled board breaks down into 7 main colours: red (32.8%), blue (18.3%) and pale blue (13.5%), plus 4 other colours. The dark board background covers 19.0% of the sample; it reads as empty space or mechanism panels rather than as a coloured block.
Level screenshot
What the Level 423 board is made of
Measured from the Level 423 image on this page, the sampled board breaks down into 7 main colours: red (32.8%), blue (18.3%) and pale blue (13.5%), plus 4 other colours. The dark board background covers 19.0% of the sample; it reads as empty space or mechanism panels rather than as a coloured block.
- Sampled colours
- 7
- Sample coverage
- 45.0%
- Empty sample rows
- 1
- Colour groups
- 34
The sample covers 45.0% of a 20x28 lattice: 7 colours, 1 empty rows and 34 separate colour groups.
red 32.8% of the sample
Spread across the sampled board rather than parked in one corner.
blue 18.3% of the sample
Spread across the sampled board rather than parked in one corner.
pale blue 13.5% of the sample
Sits almost entirely on the outer rim, where the door slots are. Treat it as a rim or door colour rather than another block group.
green 6.1% of the sample
Spread across the sampled board rather than parked in one corner.
dark green 4.8% of the sample
Spread across the sampled board rather than parked in one corner.
light grey 3.2% of the sample
Sits almost entirely on the outer rim, where the door slots are. Treat it as a rim or door colour rather than another block group.
orange 2.3% of the sample
Spread across the sampled board rather than parked in one corner.
navy 19.0% of the sample
Dark board backing — empty cells or mechanism panels, not a coloured block.
Read from the board image on this page, last measured 2026-10-19. Percentages are shares of the sampled board; the sample grid is not the game's exact cell grid.
How to read this board
Start from the largest colour: red
Red covers 32.8% of the sampled board — more than any other colour. It has the most pieces to route, so clear it early once its door is reachable instead of leaving it until the board is tight.
Rim colours are doors, not extra blocks
pale blue and light grey appear almost only on the outer rim. They mark door slots or trim; do not count them as another group of pieces to clear.
The board starts crowded
Only 19.0% of the sample is dark background. With little spare space, every parked block costs a lane; plan two or three moves ahead before sliding into the centre.
7 measured colours
The sample contains 7 main colours. Fewer colours means fewer door groups to track, but the remaining pieces can still block each other; clear one colour at a time.
How the Level 423 clear works
The sample fills 45.0% of its 20x28 lattice and splits into 7 colours and 34 groups. More sampled pieces sit in the top third (63.5%) than in the bottom third (25.0%), so the upper lanes carry most of the traffic. Red is the most divided colour, with 7 separate groups in the sample. Space is shared, so the order matters more than the speed: a block parked in a doorway can wall off another colour completely.
Level 423 sits in the Advanced tier and in the 401–440 block of this guide. Advanced boards usually have more blocks than comfortable free space. Every parked block costs a lane, so plan two or three moves ahead and keep the board's center clear. The sample has one empty row and no full-width corridor, so spare space is limited.
Strategy note 1
With only 1 empty row in the sample, every move has to open the next one. Plan two moves ahead before sliding into the middle.
Strategy note 2
Red is split into 7 groups. Clear the group closest to its door first; the far groups stay blocked until that run is finished.
Strategy note 3
Only 45.0% of the sample is covered, so the edges can hold waiting blocks while the centre stays open.
Strategy note 4
If two colours are split into several groups, finish the smaller colour first so it stops competing for lanes.
Strategy note 5
Solve one colour at a time instead of pushing several blocks around at once.
These notes combine the measured 7-colour sample with the advanced mechanics, not a move-by-move transcript. The video above is the exact clear for this board.
Block Out Level 423 — frequently asked questions
- What colours are on the Block Out Level 423 board?
- The board image on this page breaks down into 7 main colours: red (32.8%), blue (18.3%), pale blue (13.5%), green (6.1%), dark green (4.8%), light grey (3.2%), orange (2.3%). The names are read off the measured hex values shown beside each swatch, so they can differ from the name the game gives the same block.
- Which colour covers the most of the Level 423 board?
- Red is the largest measured colour at 32.8% of the sample. That makes it the colour with the most pieces to route, so it is usually the one worth clearing early once its door is open.
- How much of the Level 423 board is empty?
- The dark board background covers 19.0% of the sample. It can include empty cells and mechanism panels, so read it as spare backing area rather than a count of free moves.
- Does the board image show the order to move the blocks?
- No. A still image shows the colours and their layout, but not the block queue or the order the game offers. The video on this page is the exact clear; the measured breakdown is what the board costs to clear, not a tap-by-tap order.
- How is the Level 423 board laid out?
- The sample fills 45.0% of its 20x28 lattice and splits into 7 colours and 34 groups. More sampled pieces sit in the top third (63.5%) than in the bottom third (25.0%), so the upper lanes carry most of the traffic. The sample has one empty row and no full-width corridor, so spare space is limited.
- What difficulty is Level 423 in Block Out?
- Level 423 is rated Advanced difficulty in Block Out! - Color Sort Puzzle. Tiers run from Beginner (1-99) through Intermediate (100-249) and Advanced (250-449) to Expert (450 and up).
- Is there a video walkthrough for Block Out Level 423?
- Yes — the video on this page plays the complete clear of this board, so you can follow the block routes in real time.
- Why do I get stuck on Block Out Level 423?
- Most jams on Level 423 come from opening a second colour before the first is off the board. The sample holds 7 colours split into 34 groups, so every extra front costs a lane. Clear one colour at a time, keep the middle open, and treat the edges as waiting space.
- Does Block Out work offline?
- Yes. Block Out! - Color Sort Puzzle can be played offline once installed — there are no online requirements during normal play.
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