How do I stop the frog in Level 260?

Wait for its tongue to extend, then pin the tongue's left end with the small gray stone.

Which rock should I use?

Use the small loose stone in front of the large boulder behind Lily.

Once the frog's tongue is pinned, drag a red apple from the right-hand tree directly into Lily's arms.

Brain Test 4 level guide

medium 7 colors

Brain Test 4 Level 260 pins the frog's stretched pink tongue with the small gray stone, then drags a red apple across the stream into Lily's arms.

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Wait for the frog by the tree to stretch its pink tongue toward the ants on Lily's bank.
Press the small gray stone lying in front of the large boulder behind Lily.
Drag the stone onto the far-left tip of the extended tongue and release it there.
Press a red apple in the right-hand tree and drag it left across the blue stream.
Drop the apple into Lily's arms while the tongue remains pinned, then wait for the green check.

Colors in this level:

Green, Blue, Red, Gray, Pink, Brown, Black

Moving an apple before restraining the frog's tongue and allowing the fruit to be intercepted.
Trying to drag the large boulder instead of the separate small gray stone.
Dropping the stone into the stream or onto the frog rather than on the tongue's left tip.

Board notes 5 details

Layout: Lily and two gray rocks are on the left bank, a green frog waits beside the right-bank apple tree, and black ants attract its long tongue across the blue stream.
Goal: Restrain the frog's tongue long enough to transfer one apple safely from the right canopy to Lily on the left.
Opening: Wait for the pink tongue to reach toward the ants, then move the small loose stone onto its far-left tip.
Danger Zone: Dragging an apple while the tongue is free lets the frog interfere; the large boulder is a decoy, so pin the tongue with the smaller stone first.
Mechanics: A temporary animal animation exposes an interactive tongue that can be locked in its extended state with a movable weight.

How do I stop the frog in Level 260?
Wait for its tongue to extend, then pin the tongue's left end with the small gray stone.
Which rock should I use?
Use the small loose stone in front of the large boulder behind Lily.
How does Lily finally get the apple?
Once the frog's tongue is pinned, drag a red apple from the right-hand tree directly into Lily's arms.