Marble Sort Level 90 is a classic squeeze play. Massive blocks of purple, bright green, light blue and yellow sit right at the front edge looking like easy clears, but they're not. The real dictator is the row of five numbered Tunnels behind them, each stamped with a 3, holding back the entire back half of the board.
The front row runs purple, bright green, teal and yellow 9-marble blocks, with two reds on the far left, a white in the middle and another red on the right behind them. Your columns start with Red, Yellow, Red and Teal on top, with Mystery Boxes and hidden colours beneath. The red is the bait — you only have three accessible red marbles before the Tunnels.
Marble Sort Level 90 Walkthrough
You have two Red Boxes but only three red marbles, so forcing both strands you. Play the guaranteed clears first — the yellow and one Red Box — to drop the Tunnel timers and open the back half. Space on the belt is everything, so never pull without a destination.
Get those Tunnels to zero and catch the wave that follows.
How to Beat Marble Sort Level 90 — Step-by-Step
The opening Box clear
- Tap the giant yellow block on the front left into the Yellow Box in column two — a guaranteed clear.
- The Tunnels drop from 3 to 2, exposing a Pink Box in column two.
- Grab the two reds on the left and the one on the right, and send all three into just ONE Red Box to clear it.
- The Tunnels drop to 1 — leave the other Red Box and any Mystery Box alone for now.
- Dig the pink marbles from behind the yellow block to clear the Pink Box, dropping the Tunnels to 0.
Manage the Tunnel rush
- The Tunnels dump dark blue, orange and dark green — catch the overflow against your newly revealed rows.
- Clear the Teal Box in column four with the giant teal block, exposing the Purple Box under it.
- Clear that Purple Box with the giant purple block from the front right.
- Feed any Orange or Dark Blue that a Mystery Box reveals from the Tunnel wave.
Clear the final Mystery Boxes
- Keep the belt to a three-marble maximum while the last Mystery Boxes reveal.
- Drain the final white and green marbles from the deep center into column three.
- Leave room to catch the last Tunnel's dump, then match the stragglers to finish.
Tips & tricks
- Send all three red marbles into one Red Box — never try to fill both at once.
- Drop the Tunnel timers fast with the yellow, red and pink clears.
- Keep the belt at three marbles max through the Mystery Box endgame.
Common mistakes
- Trying to clear both Red Boxes with only three red marbles, stranding reds on the belt.
- Panic-tapping the Tunnel wave and dumping dark blue or orange with no Box ready.
Marble Sort Level 90 FAQ
Why does my Conveyor Belt flood on Marble Sort Level 90?
You tried to fill both Red Boxes with only three red marbles, or dumped a Tunnel colour with no Box. One Red Box at a time.
Which color do I clear first on Marble Sort Level 90?
The giant yellow block on the front left. It's a guaranteed clear that drops the Tunnel timers and exposes the Pink Box.
How many moves does it take to clear Marble Sort Level 90?
Three phases — drop the Tunnel timers, ride the Tunnel rush, then clear the Mystery Boxes. Around a dozen taps.
Do I need boosters to beat Marble Sort Level 90?
No. Clear one Red Box, drop the timers, and catch the Tunnel wave. Boosters won't fix a stranded red.
What happens if I force both Red Boxes on Marble Sort Level 90?
You run out of red marbles and strand them on the belt, with no way to finish the sequence before the Tunnels open.
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