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| 1: Starting off | 
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| 2: Working upwards | 
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| 3: Later levels: Sentinel has friends! | 
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| 4: Sentinel's Stare. | 
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| 5: A starting position in difficult terrain | 
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| 6: A 'map view' of a landscape | 
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| 7: A view to the top | 
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| 8: Zoom, zoom, zoom | 
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| 9: Spectacular mountain landscape | 
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| 10: Scanning: well-hidden? | 
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| 11: Tougher levels, more Sentries! | 
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| 12: No energy, scan imminent! Must transfer! | 
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| 13: Hard terrain. Keep your options open | 
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| 14: The Sentinel sees you from afar | 
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| 15: Moving to hide | 
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| 16: Get out of that one... | 
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| 17: Map View shows it's safe for now. | 
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| 18: Sometimes close moves are best. |