diff --git a/src/gamelib/collider.cpp b/src/gamelib/collider.cpp
index 14613bb..e58b1de 100644
--- a/src/gamelib/collider.cpp
+++ b/src/gamelib/collider.cpp
@@ -60,8 +60,10 @@ namespace curry {
 		const vec2f& parTo,
 		const WorldGrid& parWorld
 	) {
+		std::cout << "---------------- collision test start --------------------\n";
 		const vec2f direction = parTo - parFrom;
 		std::cout << "direction: " << direction << ' ';
+		std::cout << "src_tile=" << pixel_to_world_tile(parWorld, parFrom) << '\n';
 		if (direction == 0.0f)
 			return parTo;
 
@@ -69,24 +71,28 @@ namespace curry {
 		const vec2us length = check_tiles_count(parObjectSize, direction);
 		std::cout << "side_offset: " << side_offset << " length: " << length << '\n';
 		const vec2us dest_tile = pixel_to_world_tile(parWorld, parTo);
-		vec2us stop_at = pixel_to_world_tile(parWorld, parFrom);
+		const vec2f pix_side_offset =
+			make_pixel_side_offset(parWorld.tile_size(), side_offset, direction);
+		vec2us stop_at = pixel_to_world_tile(parWorld, parFrom + pix_side_offset);
 		vec2f tile_relative_offs = parTo - world_tile_to_pixel(parWorld, dest_tile);
 		assert(tile_relative_offs < vector_cast<vec2f>(parWorld.tile_size()));
 
 		auto forward_callback = [=,&parWorld,&stop_at,&tile_relative_offs](vec2us tile) {
-			for (auto curr_pos : vwr::increasing_sequence_range<vec2us>(tile, tile + parObjectSize)) {
+			std::cout << "\t------------------- callback invoked ---------------\n";
+			for (auto curr_pos : vwr::increasing_sequence_range<vec2us>(tile, tile + length)) {
+				std::cout << "\ttesting " << curr_pos << " (stop_at=" << stop_at << ", tile=" << tile << ")\n";
 				const bool walkable = parWorld.tile_property(parWorld.tile(curr_pos)).walkable;
 				if (not walkable) {
+					std::cout << "\t*not* walkable!\n";
 					tile_relative_offs = vec2f(0.0f);
 					return false;
 				}
 			}
-			stop_at = tile - side_offset;
+			stop_at = tile;
+			std::cout << "\tstop_at set to " << stop_at << " and returning from callback\n";
 			return true;
 		};
 
-		const vec2f pix_side_offset =
-			make_pixel_side_offset(parWorld.tile_size(), side_offset, direction);
 		for_each_voxel_under_segment(
 			parFrom + pix_side_offset,
 			parTo + pix_side_offset,
@@ -95,7 +101,12 @@ namespace curry {
 			forward_callback,
 			false
 		);
+		std::cout << "loop done\n";
 
+		std::cout << "world_tile_to_pixel() = " << world_tile_to_pixel(parWorld, stop_at) <<
+			" tile_relative_offs: " << tile_relative_offs <<
+			" pix_side_offset: " << pix_side_offset << '\n';
+		std::cout << "returning " << world_tile_to_pixel(parWorld, stop_at) + tile_relative_offs - pix_side_offset << '\n';
 		return world_tile_to_pixel(parWorld, stop_at) + tile_relative_offs - pix_side_offset;
 	}
 } //namespace curry