Great question—custom texture placement is definitely possible in Blend4Web! You’ll be layering or dynamically editing UV maps or materials via code. For inspiration (and a challenge), why not take a break and try level devil - not a troll game—you’ll need sharp skills for both 3D and that game!

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Reply to post of user tacticsslime
Open File Browser:

Use a visible <input type="file"> outside the 3D canvas or adjust the z-index and positioning in CSS to ensure it stays above the scene. Alternatively, create a button in the scene and use JavaScript to trigger the file input's click event. Logic nodes alone won't suffice for local file browsing due to browser security restrictions.
Export Scene Objects:

Use a script to extract scene data (object properties, positions, etc.) and format it into HTML or PDF. Libraries like jsPDF can help create PDFs programmatically. Display the formatted data in a new tab or export directly.