It included a Superplay DVD featuring a world record scoring run by a top ranked player.

A pedestrian bridge, state-of-the-art skyscrapers, a stadium with a large baseball field and even an indoor sky slope, but the roads and structures are littered with enemy aircraft and artillery emplacements, hidden and ready to strike.

Armored Green - SUBURB A forward operating base hidden deep in the forest surrounding the city.

Lurk in the Darkness - DEFENSIVE LINE A valley and rocky path is in the way towards EVAC's Headquarters, but unknown to the pilots, the old staging and testing area has been extensively retrofitted and fortified in an attempt to stop their advance.

Continuing with Cave's long-standing tradition, more skilled players can enter a second round of the game, consisting of the same stages with noticeably increased difficulty.

There are two sets of conditions: In the year 2054, chaos spreads over the globe as global warming finally exacts its toll on Earth: the ice caps quickly melt, causing a tremendous series of cataclysms and for entire nations to disappear under the sea.

The near apocalyptic setting and the quickly depleting resources of the remaining dry lands force nations into constant war, eventually culminating into World War III; all efforts by the United Nations to cease hostilities are thwarted by a seemingly endless supply of technologically advanced weaponry being sold to each side of every conflict.

After investigation, the source is tracked back to EVAC Industry co. ltd, an arms dealer who's been reaping tremendously high profits from the situation, at times directly intervening to fuel the hostilities with utter disregard towards human lives; any attempt to negotiate with the board of directors has utterly failed, the earnings having proven high enough for the company to build its own cities, shipyards, defensive emplacements and even a private airport, to the point of assembling its own army of extremely well equipped mercenary troops.

Being unable to enter the fray officially, the UN sets up a strike team of four pilots, each pair given one of two advanced helicopters: the plan is to simulate a rebellion within EVAC forces and bring down the company's headquarters, where research on a series of tremendous warmachines is taking place; for this reason, the planes both bear EVAC insignia and callsigns and are built according to stolen prototype blueprints - by no means, in success or failure, must the operation be traced back to the United Nations.

For all this secrecy to be effective, even in victories the assault choppers will have to be destroyed and the pilots killed, but to compensate for their sacrifice, the UN shall fulfill one of their wishes, no matter what it is.

Specifically, the second half of stage 5 employs a quick swap of the entire background plane, coupled with reversing the overall scrolling direction ("tate-ana").

[citation needed] In 2003, Cave released a mobile phone version of the game as two separate titles, available for imode (for 504/505/506 and FOMA90*i series) and Yahoo platforms.

The player's goal is to earn ranks by repeatedly defeating the same boss, but with increasing difficulty in successive runs.

In 2007, Arika's vice president Ichiro Mihara mentioned the release of Nintendo DS version of Ketsui in his personal page [1].

[5] Famitsu magazine awarded Ketsui: Kizuna Jigoku Tachi Extra a score of 26/40 based on four reviews (6/7/7/6).