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Bottom Expander

The Bottom Expander ad unit (also sometimes referred to as a "Catfish" ad) is positioned at the bottom of the page. Designed to expand "up" on either click or mouse over, the unique characteristic of this unit is that it always remains visible on screen - evwn when the viewer scrolls up or down.

Mobile Pull
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Mobile Interstitial w/Video
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Mobile Slider
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Mobile Adhesion Banner
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Mobile Interstitial
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Superstitial
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Pencil Pushdown
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Sticky Note
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Corner Peel
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Interstitial
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Sliding Billboard
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Bottom Expander
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Video Pencil Push
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Video 300x250
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Wallpaper
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300x250 Expander Right
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728x90 Expander
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300x250 Expander Left
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300x250
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728x90
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160x600
See Example

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Impact Engine is a trademark of Impact Engine, Inc.  Copyright © 2025 Impact Engine, Inc.

Impact Engine owns the following patents: U.S. Patent No. 8,356,253; U.S. Patent No. 8,930,832; U.S. Patent No. 9,805,393; U.S. Patent No. 10,068,253;  U.S. Patent No. 10,565,618; U.S. Patent No. 7,870,497; U.S. Patent No. 9,361,632; U.S. Patent No. 10,572,898; U.S. Patent No. 11,488,206; U.S. Patent No. 11,587,117; U.S. Patent No. 11,669,863; U.S. Patent No. 11,798,031; U.S. Patent No. 11,803,876; U.S. Patent No. 11,978,088; and U.S. Patent No. 12,248,964.