Levels 21-30
Level 21: Flag

This level requires you to make your way across two separate bridges by riding along with passing bikers. If you pay attention as you reach the end of the second bridge, you’ll spot this level’s lost schim pacing in the shadow of a stop sign.
The matching collectible is in the nearby fenced-off park, which is easiest to spot by looking for the yellow advertising board on its closest corner. Getting inside is easy, at which point you can spot the flag lying flat underneath a tree (above). To get back to the rest of the level, it’s easiest to wait for a pedestrian who’s going the right way and hitch a ride.
Level 22: Container

This stage is packed, considering how short it is. When you reach the traffic stop near the start of the level, get into the streetlight’s shadow and hitch a ride with one of the bicyclists in the left turn lane. Ride that shadow all the way down the street until you spot a dumpster by the side of the road, which is easier if you rotate the camera as soon as you make the turn. This recycling container is overturned behind it.
Level 22: Bucket

This one’s tricky. When you reach the ice cream shop, wait under the parasol for a bicyclist to come down the nearby side road (above). There is a very slim window of opportunity for you to jump from that bicyclist’s shadow to the nearby tree that overlooks the canal.
If you can make that jump, the rest of this is duck soup. Make your way down the side road, past the construction gangplank, to find a bucket in the shadow of a tree at the end of the lane. Once you grab it, a couple of extra traffic cones spawn in the road, which make it much easier to get back the way you came.
Level 22: Handbag

Right before the end of the stage, you can spot this in the bus stop.
Level 23: Shopping Cart

At the beginning of the level, go to your right along the curb. When you reach the street, hop into the traffic barriers’ shadow and lower them, which lets you use their shadow as a bridge to cross the road. On the other side, raise the closest barrier again, which lets you hop into the nearby flags’ shadows. The overturned shopping cart is behind the furthest flag.
Level 23: Cornflakes

Before you ride a shopper’s shadow into the supermarket, go past the building until you see the vending machine. The box of cornflakes is right next to it in another overturned cart.
Level 24: Soda Crate

This one’s sneaky. You’ll likely spot the lost schim within seconds of starting the level, which is hanging out in an employee’s shadow near the store’s entrance. What the game doesn’t really show you is that you can leap right through the doorway behind the schim (above), which takes you to the supermarket’s stock room.

Navigate through the shadows, past the forklift, to one of the ad boards. Use it to launch yourself to the far end of the room, past the bar, to find the soda crate propped up behind it (above, bottom center). You can then use a second ad board to launch yourself back the way you came and carry on.
Level 26: Child’s Cap

This is the same map as level 22, but reversed and at night. Head back to the side road by the ice cream shop where you found the Bucket, and once again, wait for a passing bicyclist. If you time it right, you can use their shadow to reach the tree across the street and grab the child’s cap (above, center).
Level 27: Traffic Cone

You only have to go a little out of your way for this one. Just before the last turn-off to your final goal, look for the dog by the side of the road, next to the person who’s pacing in circles. The overturned traffic cone is next to them, at an angle that makes it look like a big orange rectangle.
Level 28: Umbrella

This is one of the more difficult sequences in the game. From the start of the game, go straight forward along the road, but don’t turn onto the bridge over the canal. Instead, keep going forward until you reach a couple of big traffic barriers (above).
The challenge here is to use the combination of the flickering streetlights and the lightning flash to navigate across the street. This requires you to anticipate and preemptively jump so you land in a new shadow right as it’s being made. Once you’ve got a grip on the timing, you can use your extra jump to provide some leeway, as your schim won’t respawn until it’s been on the ground for a couple of consecutive seconds.

It’ll take some practice to nail the timing, but once you get it down, you can grab the umbrella off of the street on the other side of the raised drawbridge (above, top left).
Level 28: Brand New Bike

From the previous schim, go back the way you came and cross the bridge. At its end, you’ll spot a lost schim in the shadow of an advertising board (above, top left), but there’s no cover between it and you.
Like the umbrella, you have to time your jumps here to take advantage of the lightning, which flashes roughly every nine seconds. You’ll have to jump early so your schim is in mid-air when the shadow appears. If you time it right, you should have just enough time to get from the tree’s shadow to the ad board before the lightning fades out.

From there, simply go down the street past the board to find a brand new bike by the traffic barriers (above, top).