player starts at bottom and goes through differently shaped tunnels fighting off various enemies that get harder per room number
3 portals exist at the end of every tunnel that lead to pre-determined destinations. some go back and some forward, far or near your current frame

ROOM#	PORTAL1	PORTAL2	PORTAL3
1	2	4	3
2	4	3	3
3	2	5	5
4	5	3	6
5	6	6	6
6	7	8	7
7	8	9	1
8 	5	10	9
9	10	8	10
10	12	1	11
11	12	12	7
12	13	14	13
13	1	14	12
14	15	8	15
15	17	16	13
16	15	17	18
17	12	19	10
18	19	17	15
19	1	20	18
20	19	exit	19