The Explosion Traps are craters and/or holes found on the ground in Stages. In gameplay, they spew out tall pillars of fire and magma in intervals which will damage the player upon physical contact.
In Sonic Adventure, and its enhanced port Sonic Adventure DX: Director's Cut, the Explosion Traps appear exclusively in all of Red Mountain's sections. They appear as piles of unstable rocks on the ground and lava that has hot air stemming from them. Once the player gets near them, they will continuously spit out large magma rocks that harm the player upon contact into the air.
Sonic the Hedgehog (2006)
In Sonic the Hedgehog (2006), Explosive Traps appear exclusively in Flame Core. In this game, they appear as darken and wide craters on both the ground and vertical surfaces. When they are about to erupt, their craters glow orange.
Sonic and the Black Knight
In the console/PC version of Sonic Generations, Explosive Craters appears in both acts of Crisis City. In this game, their crater is much smaller and the height of the their flame pillars switches between high and short in intervals. However, their flames can be rendered harmless with the Flame Shield or Super Sonic.